Change GNU URLs to use https.

4 files changed, 696 insertions, 659 deletions

diff --git a/doc/ChangeLog b/doc/ChangeLog
index e792b814..99ae61c4 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2017-09-18         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in: Change GNU URLs to use `https://...'.
+	Revise UPDATE_MONTH.
+
 2017-09-17         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in: Change 'namespace' to 'name_space' where it matters
diff --git a/doc/gawk.info b/doc/gawk.info
index a0613b96..5b757a51 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -1147,10 +1147,10 @@ Typographical Conventions
 =========================
 
 This Info file is written in Texinfo
-(http://www.gnu.org/software/texinfo/), the GNU documentation formatting
-language.  A single Texinfo source file is used to produce both the
-printed and online versions of the documentation.  This minor node
-briefly documents the typographical conventions used in Texinfo.
+(https://www.gnu.org/software/texinfo/), the GNU documentation
+formatting language.  A single Texinfo source file is used to produce
+both the printed and online versions of the documentation.  This minor
+node briefly documents the typographical conventions used in Texinfo.
 
    Examples you would type at the command line are preceded by the
 common shell primary and secondary prompts, '$' and '>'.  Input that you
@@ -1213,9 +1213,9 @@ Public License (GPL) to ensure that its software's source code is always
 available to the end user.  A copy of the GPL is included for your
 reference (*note Copying::).  The GPL applies to the C language source
 code for 'gawk'.  To find out more about the FSF and the GNU Project
-online, see the GNU Project's home page (http://www.gnu.org).  This Info
-file may also be read from GNU's website
-(http://www.gnu.org/software/gawk/manual/).
+online, see the GNU Project's home page (https://www.gnu.org).  This
+Info file may also be read from GNU's website
+(https://www.gnu.org/software/gawk/manual/).
 
    A shell, an editor (Emacs), highly portable optimizing C, C++, and
 Objective-C compilers, a symbolic debugger and dozens of large and small
@@ -2829,7 +2829,7 @@ environments.
    (1) For more detail, please see Section 4.4 of RFC 3875
 (http://www.ietf.org/rfc/rfc3875).  Also see the explanatory note sent
 to the 'gawk' bug mailing list
-(http://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html).
+(https://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html).
 
    (2) Not recommended.
 
@@ -2974,7 +2974,7 @@ true for both '--traditional' and '--posix'.  *Note Options::.
 path is searched again after adding the suffix '.awk' to the file name.
 
    'gawk''s path search mechanism is similar to the shell's.  (See 'The
-Bourne-Again SHell manual' (http://www.gnu.org/software/bash/manual/).)
+Bourne-Again SHell manual' (https://www.gnu.org/software/bash/manual/).)
 It treats a null entry in the path as indicating the current directory.
 (A null entry is indicated by starting or ending the path with a colon
 or by placing two colons next to each other ['::'].)
@@ -18838,7 +18838,7 @@ hand.  Here we present a program that can extract parts of a Texinfo
 input file into separate files.
 
    This Info file is written in Texinfo
-(http://www.gnu.org/software/texinfo/), the GNU Project's document
+(https://www.gnu.org/software/texinfo/), the GNU Project's document
 formatting language.  A single Texinfo source file can be used to
 produce both printed documentation, with TeX, and online documentation.
 (The Texinfo language is described fully, starting with *note (Texinfo,
@@ -20341,7 +20341,7 @@ use, 'gawk' automatically falls back to using regular pipes.
 earlier, at some loss in performance.  This is because the tty driver
 buffers and sends data line-by-line.  On systems with the 'stdbuf' (part
 of the GNU Coreutils package
-(http://www.gnu.org/software/coreutils/coreutils.html)), you can use
+(https://www.gnu.org/software/coreutils/coreutils.html)), you can use
 that program instead of ptys.
 
    Note also that ptys are not fully transparent.  Certain binary
@@ -21408,7 +21408,7 @@ complexity.  Thus, most programming languages have facilities available
 for "debugging" programs, and now 'awk' is no exception.
 
    The 'gawk' debugger is purposely modeled after the GNU Debugger (GDB)
-(http://www.gnu.org/software/gdb/) command-line debugger.  If you are
+(https://www.gnu.org/software/gdb/) command-line debugger.  If you are
 familiar with GDB, learning how to use 'gawk' for debugging your program
 is easy.
 
@@ -27188,10 +27188,10 @@ command is as follows:
 parser library installed in order to build and use the XML extension.
 
    In addition, you must have the GNU Autotools installed (Autoconf
-(http://www.gnu.org/software/autoconf), Automake
-(http://www.gnu.org/software/automake), Libtool
-(http://www.gnu.org/software/libtool), and GNU 'gettext'
-(http://www.gnu.org/software/gettext)).
+(https://www.gnu.org/software/autoconf), Automake
+(https://www.gnu.org/software/automake), Libtool
+(https://www.gnu.org/software/libtool), and GNU 'gettext'
+(https://www.gnu.org/software/gettext)).
 
    The simple recipe for building and testing 'gawkextlib' is as
 follows.  First, build and install 'gawk':
@@ -28534,11 +28534,11 @@ There are two ways to get GNU software:
      supported.  If you have the 'wget' program, you can use a command
      like the following:
 
-          wget http://ftp.gnu.org/gnu/gawk/gawk-4.2.0.tar.gz
+          wget https://ftp.gnu.org/gnu/gawk/gawk-4.2.0.tar.gz
 
    The GNU software archive is mirrored around the world.  The
 up-to-date list of mirror sites is available from the main FSF website
-(http://www.gnu.org/order/ftp.html).  Try to use one of the mirrors;
+(https://www.gnu.org/order/ftp.html).  Try to use one of the mirrors;
 they will be less busy, and you can usually find one closer to your
 site.
 
@@ -29742,11 +29742,15 @@ B.6 Summary
    * The 'gawk' distribution is available from the GNU Project's main
      distribution site, 'ftp.gnu.org'.  The canonical build recipe is:
 
-          wget http://ftp.gnu.org/gnu/gawk/gawk-4.2.0.tar.gz
+          wget https://ftp.gnu.org/gnu/gawk/gawk-4.2.0.tar.gz
           tar -xvpzf gawk-4.2.0.tar.gz
           cd gawk-4.2.0
           ./configure && make && make check
 
+          NOTE: Because of the 'https://' URL, you may have to supply
+          the '--no-check-certificate' option to 'wget' to download the
+          file.
+
    * 'gawk' may be built on non-POSIX systems as well.  The currently
      supported systems are MS-Windows using MSYS, DJGPP, MinGW, and
      Cygwin, and both Vax/VMS and OpenVMS. Instructions for each system
@@ -29851,7 +29855,7 @@ This clones the 'gawk' repository.  If you are behind a firewall that
 does not allow you to use the Git native protocol, you can still access
 the repository using:
 
-     git clone http://git.savannah.gnu.org/r/gawk.git
+     git clone https://git.savannah.gnu.org/r/gawk.git
 
    Once you have made changes, you can use 'git diff' to produce a
 patch, and send that to the 'gawk' maintainer; see *note Bugs::, for how
@@ -29896,7 +29900,7 @@ possible to include them:
      document describes how GNU software should be written.  If you
      haven't read it, please do so, preferably _before_ starting to
      modify 'gawk'.  (The 'GNU Coding Standards' are available from the
-     GNU Project's website (http://www.gnu.org/prep/standards/).
+     GNU Project's website (https://www.gnu.org/prep/standards/).
      Texinfo, Info, and DVI versions are also available.)
 
   5. Use the 'gawk' coding style.  The C code for 'gawk' follows the
@@ -30181,12 +30185,16 @@ on; it was really painful.  When the repository is self-contained, using
      worked for years (and still works).  He had '/usr/local/bin' at the
      front of his 'PATH' and just did:
 
-          wget http://ftp.gnu.org/gnu/PACKAGE/PACKAGE-X.Y.Z.tar.gz
+          wget https://ftp.gnu.org/gnu/PACKAGE/PACKAGE-X.Y.Z.tar.gz
           tar -xpzvf PACKAGE-X.Y.Z.tar.gz
           cd PACKAGE-X.Y.Z
           ./configure && make && make check
           make install    # as root
 
+          NOTE: Because of the 'https://' URL, you may have to supply
+          the '--no-check-certificate' option to 'wget' to download the
+          file.
+
    Most of the above was originally written by the maintainer to other
 'gawk' developers.  It raised the objection from one of the developers
 "... that anybody pulling down the source from Git is not an end user."
@@ -30205,7 +30213,7 @@ significant change being introduced.
    Fortunately, the Git server can meet this need.  For any given branch
 named BRANCHNAME, use:
 
-     wget http://git.savannah.gnu.org/cgit/gawk.git/snapshot/gawk-BRANCHNAME.tar.gz
+     wget https://git.savannah.gnu.org/cgit/gawk.git/snapshot/gawk-BRANCHNAME.tar.gz
 
 to retrieve a snapshot of the given branch.
 
@@ -35863,569 +35871,569 @@ Ref: Names-Footnote-156161
 Node: This Manual56308
 Ref: This Manual-Footnote-162793
 Node: Conventions62893
-Node: Manual History65247
-Ref: Manual History-Footnote-168242
-Ref: Manual History-Footnote-268283
-Node: How To Contribute68357
-Node: Acknowledgments69008
-Node: Getting Started73916
-Node: Running gawk76355
-Node: One-shot77545
-Node: Read Terminal78808
-Node: Long80801
-Node: Executable Scripts82314
-Ref: Executable Scripts-Footnote-185109
-Node: Comments85212
-Node: Quoting87696
-Node: DOS Quoting93213
-Node: Sample Data Files95269
-Node: Very Simple97864
-Node: Two Rules102766
-Node: More Complex104651
-Node: Statements/Lines107517
-Ref: Statements/Lines-Footnote-1111976
-Node: Other Features112241
-Node: When113177
-Ref: When-Footnote-1114931
-Node: Intro Summary114996
-Node: Invoking Gawk115880
-Node: Command Line117394
-Node: Options118192
-Ref: Options-Footnote-1134811
-Ref: Options-Footnote-2135041
-Node: Other Arguments135066
-Node: Naming Standard Input138013
-Node: Environment Variables139106
-Node: AWKPATH Variable139664
-Ref: AWKPATH Variable-Footnote-1143075
-Ref: AWKPATH Variable-Footnote-2143109
-Node: AWKLIBPATH Variable143370
-Node: Other Environment Variables144627
-Node: Exit Status148448
-Node: Include Files149125
-Node: Loading Shared Libraries152720
-Node: Obsolete154148
-Node: Undocumented154840
-Node: Invoking Summary155137
-Node: Regexp156797
-Node: Regexp Usage158251
-Node: Escape Sequences160288
-Node: Regexp Operators166520
-Ref: Regexp Operators-Footnote-1173936
-Ref: Regexp Operators-Footnote-2174083
-Node: Bracket Expressions174181
-Ref: table-char-classes176657
-Node: Leftmost Longest179794
-Node: Computed Regexps181097
-Node: GNU Regexp Operators184524
-Node: Case-sensitivity188203
-Ref: Case-sensitivity-Footnote-1191090
-Ref: Case-sensitivity-Footnote-2191325
-Node: Regexp Summary191433
-Node: Reading Files192899
-Node: Records195168
-Node: awk split records195901
-Node: gawk split records200832
-Ref: gawk split records-Footnote-1205372
-Node: Fields205409
-Node: Nonconstant Fields208150
-Ref: Nonconstant Fields-Footnote-1210386
-Node: Changing Fields210590
-Node: Field Separators216518
-Node: Default Field Splitting219216
-Node: Regexp Field Splitting220334
-Node: Single Character Fields223687
-Node: Command Line Field Separator224747
-Node: Full Line Fields227965
-Ref: Full Line Fields-Footnote-1229487
-Ref: Full Line Fields-Footnote-2229533
-Node: Field Splitting Summary229634
-Node: Constant Size231708
-Node: Fixed width data232440
-Node: Skipping intervening235907
-Node: Allowing trailing data236705
-Node: Fields with fixed data237742
-Node: Splitting By Content239260
-Ref: Splitting By Content-Footnote-1242910
-Node: Testing field creation243073
-Node: Multiple Line244694
-Ref: Multiple Line-Footnote-1250578
-Node: Getline250757
-Node: Plain Getline253226
-Node: Getline/Variable255867
-Node: Getline/File257018
-Node: Getline/Variable/File258406
-Ref: Getline/Variable/File-Footnote-1260011
-Node: Getline/Pipe260099
-Node: Getline/Variable/Pipe262806
-Node: Getline/Coprocess263941
-Node: Getline/Variable/Coprocess265208
-Node: Getline Notes265950
-Node: Getline Summary268747
-Ref: table-getline-variants269171
-Node: Read Timeout269919
-Ref: Read Timeout-Footnote-1273825
-Node: Retrying Input273883
-Node: Command-line directories275082
-Node: Input Summary275988
-Node: Input Exercises279160
-Node: Printing279888
-Node: Print281722
-Node: Print Examples283179
-Node: Output Separators285959
-Node: OFMT287976
-Node: Printf289332
-Node: Basic Printf290117
-Node: Control Letters291691
-Node: Format Modifiers295679
-Node: Printf Examples301694
-Node: Redirection304180
-Node: Special FD311021
-Ref: Special FD-Footnote-1314189
-Node: Special Files314263
-Node: Other Inherited Files314880
-Node: Special Network315881
-Node: Special Caveats316741
-Node: Close Files And Pipes317690
-Ref: table-close-pipe-return-values324597
-Ref: Close Files And Pipes-Footnote-1325380
-Ref: Close Files And Pipes-Footnote-2325528
-Node: Nonfatal325680
-Node: Output Summary328005
-Node: Output Exercises329227
-Node: Expressions329906
-Node: Values331094
-Node: Constants331772
-Node: Scalar Constants332463
-Ref: Scalar Constants-Footnote-1333327
-Node: Nondecimal-numbers333577
-Node: Regexp Constants336578
-Node: Using Constant Regexps337104
-Node: Standard Regexp Constants337726
-Node: Strong Regexp Constants340914
-Node: Variables343872
-Node: Using Variables344529
-Node: Assignment Options346439
-Node: Conversion348312
-Node: Strings And Numbers348836
-Ref: Strings And Numbers-Footnote-1351899
-Node: Locale influences conversions352008
-Ref: table-locale-affects354766
-Node: All Operators355384
-Node: Arithmetic Ops356013
-Node: Concatenation358519
-Ref: Concatenation-Footnote-1361366
-Node: Assignment Ops361473
-Ref: table-assign-ops366464
-Node: Increment Ops367777
-Node: Truth Values and Conditions371237
-Node: Truth Values372311
-Node: Typing and Comparison373359
-Node: Variable Typing374179
-Ref: Variable Typing-Footnote-1380642
-Ref: Variable Typing-Footnote-2380714
-Node: Comparison Operators380791
-Ref: table-relational-ops381210
-Node: POSIX String Comparison384705
-Ref: POSIX String Comparison-Footnote-1386400
-Ref: POSIX String Comparison-Footnote-2386539
-Node: Boolean Ops386623
-Ref: Boolean Ops-Footnote-1391105
-Node: Conditional Exp391197
-Node: Function Calls392933
-Node: Precedence396810
-Node: Locales400469
-Node: Expressions Summary402101
-Node: Patterns and Actions404674
-Node: Pattern Overview405794
-Node: Regexp Patterns407471
-Node: Expression Patterns408013
-Node: Ranges411794
-Node: BEGIN/END414902
-Node: Using BEGIN/END415663
-Ref: Using BEGIN/END-Footnote-1418399
-Node: I/O And BEGIN/END418505
-Node: BEGINFILE/ENDFILE420819
-Node: Empty423726
-Node: Using Shell Variables424043
-Node: Action Overview426317
-Node: Statements428642
-Node: If Statement430490
-Node: While Statement431985
-Node: Do Statement434013
-Node: For Statement435161
-Node: Switch Statement438319
-Node: Break Statement440705
-Node: Continue Statement442797
-Node: Next Statement444624
-Node: Nextfile Statement447007
-Node: Exit Statement449659
-Node: Built-in Variables452062
-Node: User-modified453195
-Node: Auto-set460962
-Ref: Auto-set-Footnote-1476559
-Ref: Auto-set-Footnote-2476765
-Node: ARGC and ARGV476821
-Node: Pattern Action Summary481034
-Node: Arrays483464
-Node: Array Basics484793
-Node: Array Intro485637
-Ref: figure-array-elements487612
-Ref: Array Intro-Footnote-1490316
-Node: Reference to Elements490444
-Node: Assigning Elements492908
-Node: Array Example493399
-Node: Scanning an Array495158
-Node: Controlling Scanning498180
-Ref: Controlling Scanning-Footnote-1503579
-Node: Numeric Array Subscripts503895
-Node: Uninitialized Subscripts506079
-Node: Delete507698
-Ref: Delete-Footnote-1510450
-Node: Multidimensional510507
-Node: Multiscanning513602
-Node: Arrays of Arrays515193
-Node: Arrays Summary519960
-Node: Functions522053
-Node: Built-in523091
-Node: Calling Built-in524172
-Node: Numeric Functions526168
-Ref: Numeric Functions-Footnote-1530196
-Ref: Numeric Functions-Footnote-2530553
-Ref: Numeric Functions-Footnote-3530601
-Node: String Functions530873
-Ref: String Functions-Footnote-1554531
-Ref: String Functions-Footnote-2554659
-Ref: String Functions-Footnote-3554907
-Node: Gory Details554994
-Ref: table-sub-escapes556785
-Ref: table-sub-proposed558304
-Ref: table-posix-sub559667
-Ref: table-gensub-escapes561208
-Ref: Gory Details-Footnote-1562031
-Node: I/O Functions562185
-Ref: table-system-return-values568767
-Ref: I/O Functions-Footnote-1570747
-Ref: I/O Functions-Footnote-2570895
-Node: Time Functions571015
-Ref: Time Functions-Footnote-1581682
-Ref: Time Functions-Footnote-2581750
-Ref: Time Functions-Footnote-3581908
-Ref: Time Functions-Footnote-4582019
-Ref: Time Functions-Footnote-5582131
-Ref: Time Functions-Footnote-6582358
-Node: Bitwise Functions582624
-Ref: table-bitwise-ops583218
-Ref: Bitwise Functions-Footnote-1589251
-Ref: Bitwise Functions-Footnote-2589424
-Node: Type Functions589615
-Node: I18N Functions592532
-Node: User-defined594183
-Node: Definition Syntax594988
-Ref: Definition Syntax-Footnote-1600675
-Node: Function Example600746
-Ref: Function Example-Footnote-1603668
-Node: Function Caveats603690
-Node: Calling A Function604208
-Node: Variable Scope605166
-Node: Pass By Value/Reference608160
-Node: Return Statement611659
-Node: Dynamic Typing614638
-Node: Indirect Calls615568
-Ref: Indirect Calls-Footnote-1625819
-Node: Functions Summary625947
-Node: Library Functions628652
-Ref: Library Functions-Footnote-1632259
-Ref: Library Functions-Footnote-2632402
-Node: Library Names632573
-Ref: Library Names-Footnote-1636033
-Ref: Library Names-Footnote-2636256
-Node: General Functions636342
-Node: Strtonum Function637445
-Node: Assert Function640467
-Node: Round Function643793
-Node: Cliff Random Function645334
-Node: Ordinal Functions646350
-Ref: Ordinal Functions-Footnote-1649413
-Ref: Ordinal Functions-Footnote-2649665
-Node: Join Function649875
-Ref: Join Function-Footnote-1651645
-Node: Getlocaltime Function651845
-Node: Readfile Function655587
-Node: Shell Quoting657559
-Node: Data File Management658960
-Node: Filetrans Function659592
-Node: Rewind Function663688
-Node: File Checking665598
-Ref: File Checking-Footnote-1666932
-Node: Empty Files667133
-Node: Ignoring Assigns669112
-Node: Getopt Function670662
-Ref: Getopt Function-Footnote-1682131
-Node: Passwd Functions682331
-Ref: Passwd Functions-Footnote-1691170
-Node: Group Functions691258
-Ref: Group Functions-Footnote-1699156
-Node: Walking Arrays699363
-Node: Library Functions Summary702371
-Node: Library Exercises703777
-Node: Sample Programs704242
-Node: Running Examples705012
-Node: Clones705740
-Node: Cut Program706964
-Node: Egrep Program716893
-Ref: Egrep Program-Footnote-1724405
-Node: Id Program724515
-Node: Split Program728195
-Ref: Split Program-Footnote-1731654
-Node: Tee Program731783
-Node: Uniq Program734573
-Node: Wc Program741999
-Ref: Wc Program-Footnote-1746254
-Node: Miscellaneous Programs746348
-Node: Dupword Program747561
-Node: Alarm Program749591
-Node: Translate Program754446
-Ref: Translate Program-Footnote-1759011
-Node: Labels Program759281
-Ref: Labels Program-Footnote-1762632
-Node: Word Sorting762716
-Node: History Sorting766788
-Node: Extract Program768623
-Node: Simple Sed776152
-Node: Igawk Program779226
-Ref: Igawk Program-Footnote-1793557
-Ref: Igawk Program-Footnote-2793759
-Ref: Igawk Program-Footnote-3793881
-Node: Anagram Program793996
-Node: Signature Program797058
-Node: Programs Summary798305
-Node: Programs Exercises799519
-Ref: Programs Exercises-Footnote-1803648
-Node: Advanced Features803739
-Node: Nondecimal Data805729
-Node: Array Sorting807320
-Node: Controlling Array Traversal808020
-Ref: Controlling Array Traversal-Footnote-1816387
-Node: Array Sorting Functions816505
-Ref: Array Sorting Functions-Footnote-1821596
-Node: Two-way I/O821792
-Ref: Two-way I/O-Footnote-1828343
-Ref: Two-way I/O-Footnote-2828530
-Node: TCP/IP Networking828612
-Node: Profiling831730
-Ref: Profiling-Footnote-1840402
-Node: Advanced Features Summary840725
-Node: Internationalization842569
-Node: I18N and L10N844049
-Node: Explaining gettext844736
-Ref: Explaining gettext-Footnote-1850628
-Ref: Explaining gettext-Footnote-2850813
-Node: Programmer i18n850978
-Ref: Programmer i18n-Footnote-1855927
-Node: Translator i18n855976
-Node: String Extraction856770
-Ref: String Extraction-Footnote-1857902
-Node: Printf Ordering857988
-Ref: Printf Ordering-Footnote-1860774
-Node: I18N Portability860838
-Ref: I18N Portability-Footnote-1863294
-Node: I18N Example863357
-Ref: I18N Example-Footnote-1866163
-Node: Gawk I18N866236
-Node: I18N Summary866881
-Node: Debugger868222
-Node: Debugging869244
-Node: Debugging Concepts869685
-Node: Debugging Terms871494
-Node: Awk Debugging874069
-Node: Sample Debugging Session874975
-Node: Debugger Invocation875509
-Node: Finding The Bug876895
-Node: List of Debugger Commands883373
-Node: Breakpoint Control884706
-Node: Debugger Execution Control888400
-Node: Viewing And Changing Data891762
-Node: Execution Stack895136
-Node: Debugger Info896773
-Node: Miscellaneous Debugger Commands900844
-Node: Readline Support905932
-Node: Limitations906828
-Node: Debugging Summary908937
-Node: Arbitrary Precision Arithmetic910216
-Node: Computer Arithmetic911701
-Ref: table-numeric-ranges915292
-Ref: Computer Arithmetic-Footnote-1916014
-Node: Math Definitions916071
-Ref: table-ieee-formats919385
-Ref: Math Definitions-Footnote-1919988
-Node: MPFR features920093
-Node: FP Math Caution921810
-Ref: FP Math Caution-Footnote-1922882
-Node: Inexactness of computations923251
-Node: Inexact representation924211
-Node: Comparing FP Values925571
-Node: Errors accumulate926653
-Node: Getting Accuracy928086
-Node: Try To Round930796
-Node: Setting precision931695
-Ref: table-predefined-precision-strings932392
-Node: Setting the rounding mode934222
-Ref: table-gawk-rounding-modes934596
-Ref: Setting the rounding mode-Footnote-1938004
-Node: Arbitrary Precision Integers938183
-Ref: Arbitrary Precision Integers-Footnote-1941358
-Node: Checking for MPFR941507
-Node: POSIX Floating Point Problems942804
-Ref: POSIX Floating Point Problems-Footnote-1946675
-Node: Floating point summary946713
-Node: Dynamic Extensions948903
-Node: Extension Intro950456
-Node: Plugin License951722
-Node: Extension Mechanism Outline952519
-Ref: figure-load-extension952958
-Ref: figure-register-new-function954523
-Ref: figure-call-new-function955615
-Node: Extension API Description957677
-Node: Extension API Functions Introduction959319
-Node: General Data Types964859
-Ref: General Data Types-Footnote-1972980
-Node: Memory Allocation Functions973279
-Ref: Memory Allocation Functions-Footnote-1977487
-Node: Constructor Functions977586
-Node: Registration Functions981172
-Node: Extension Functions981857
-Node: Exit Callback Functions987072
-Node: Extension Version String988322
-Node: Input Parsers988985
-Node: Output Wrappers1001706
-Node: Two-way processors1006218
-Node: Printing Messages1008483
-Ref: Printing Messages-Footnote-11009654
-Node: Updating ERRNO1009807
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+Node: GNU Free Documentation License1314349
+Node: Index1339467
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index ba28fc09..d2a4945d 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -64,7 +64,7 @@
 @c applies to and all the info about who's publishing this edition
 
 @c These apply across the board.
-@set UPDATE-MONTH August, 2017
+@set UPDATE-MONTH September, 2017
 @set VERSION 4.2
 @set PATCHLEVEL 0
 
@@ -282,7 +282,7 @@ Boston, MA  02110-1301 USA
 Phone: +1-617-542-5942
 Fax: +1-617-542-2652
 Email: <email>gnu@@gnu.org</email>
-URL: <ulink url="http://www.gnu.org">http://www.gnu.org/</ulink></literallayout>
+URL: <ulink url="https://www.gnu.org">https://www.gnu.org/</ulink></literallayout>
 
 <literallayout class="normal">Copyright &copy; 1989, 1991, 1992, 1993, 1996&ndash;2005, 2007, 2009&ndash;2017
 Free Software Foundation, Inc.
@@ -312,7 +312,7 @@ A copy of the license is included in the section entitled
 @ifset FOR_PRINT
 A copy of the license
 may be found on the Internet at
-@uref{http://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
 the GNU Project's website}.
 @end ifset
 
@@ -364,7 +364,7 @@ Boston, MA  02110-1301 USA @*
 Phone: +1-617-542-5942 @*
 Fax: +1-617-542-2652 @*
 Email: @email{gnu@@gnu.org} @*
-URL: @uref{http://www.gnu.org/} @*
+URL: @uref{https://www.gnu.org/} @*
 
 @c This one is correct for gawk 3.1.0 from the FSF
 ISBN 1-882114-28-0 @*
@@ -1579,7 +1579,7 @@ This @value{DOCUMENT} has the difficult task of being both a tutorial and a refe
 If you are a novice, feel free to skip over details that seem too complex.
 You should also ignore the many cross-references; they are for the
 expert user and for the Info and
-@uref{http://www.gnu.org/software/gawk/manual/, HTML}
+@uref{https://www.gnu.org/software/gawk/manual/, HTML}
 versions of the @value{DOCUMENT}.
 @end ifnotinfo
 
@@ -1789,7 +1789,7 @@ printed edition. You may find them online, as follows:
 
 @itemize @value{BULLET}
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Notes.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Notes.html,
 The appendix on implementation notes}
 describes how to disable @command{gawk}'s extensions, how to contribute
 new code to @command{gawk}, where to find information on some possible
@@ -1797,20 +1797,20 @@ future directions for @command{gawk} development, and the design decisions
 behind the extension API.
 
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Basic-Concepts.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Basic-Concepts.html,
 The appendix on basic concepts}
 provides some very cursory background material for those who
 are completely unfamiliar with computer programming.
 
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Glossary.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Glossary.html,
 The Glossary}
 defines most, if not all, of the significant terms used
 throughout the @value{DOCUMENT}.  If you find terms that you aren't familiar with,
 try looking them up here.
 
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
 The GNU FDL}
 is the license that covers this @value{DOCUMENT}.
 @end itemize
@@ -1826,7 +1826,7 @@ omitted from the print edition but are available online.
 @unnumberedsec Typographical Conventions
 
 @cindex Texinfo
-This @value{DOCUMENT} is written in @uref{http://www.gnu.org/software/texinfo/, Texinfo},
+This @value{DOCUMENT} is written in @uref{https://www.gnu.org/software/texinfo/, Texinfo},
 the GNU documentation formatting language.
 A single Texinfo source file is used to produce both the printed and online
 versions of the documentation.
@@ -1973,9 +1973,9 @@ for your reference
 @end ifclear
 The GPL applies to the C language source code for @command{gawk}.
 To find out more about the FSF and the GNU Project online,
-see @uref{http://www.gnu.org, the GNU Project's home page}.
+see @uref{https://www.gnu.org, the GNU Project's home page}.
 This @value{DOCUMENT} may also be read from
-@uref{http://www.gnu.org/software/gawk/manual/, GNU's website}.
+@uref{https://www.gnu.org/software/gawk/manual/, GNU's website}.
 
 @ifclear FOR_PRINT
 A shell, an editor (Emacs), highly portable optimizing C, C++, and
@@ -2061,7 +2061,7 @@ you should first look at the @file{NEWS} file in the @command{gawk}
 distribution, which provides a high-level summary of the changes in
 each release.
 
-You can then look at the @uref{http://www.gnu.org/software/gawk/manual/,
+You can then look at the @uref{https://www.gnu.org/software/gawk/manual/,
 online version} of this @value{DOCUMENT} to read about any new features.
 @end ifset
 
@@ -4015,7 +4015,7 @@ that pass arguments through the URL; using this option prevents a malicious
 code (via @option{-e}) to the CGI application.@footnote{For more detail,
 please see Section 4.4 of @uref{http://www.ietf.org/rfc/rfc3875,
 RFC 3875}. Also see the
-@uref{http://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html,
+@uref{https://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html,
 explanatory note sent to the @command{gawk} bug
 mailing list}.}
 This option should be used
@@ -4532,7 +4532,7 @@ again after adding the suffix @samp{.awk} to the @value{FN}.
 
 @command{gawk}'s path search mechanism is similar
 to the shell's.
-(See @uref{http://www.gnu.org/software/bash/manual/,
+(See @uref{https://www.gnu.org/software/bash/manual/,
 @cite{The Bourne-Again SHell manual}}.)
 It treats a null entry in the path as indicating the current
 directory.
@@ -26372,7 +26372,7 @@ them in by hand.  Here we present a program that can extract parts of a
 Texinfo input file into separate files.
 
 @cindex Texinfo
-This @value{DOCUMENT} is written in @uref{http://www.gnu.org/software/texinfo/, Texinfo},
+This @value{DOCUMENT} is written in @uref{https://www.gnu.org/software/texinfo/, Texinfo},
 the GNU Project's document formatting language.
 A single Texinfo source file can be used to produce both
 printed documentation, with @TeX{}, and online documentation.
@@ -26380,7 +26380,7 @@ printed documentation, with @TeX{}, and online documentation.
 (Texinfo is fully documented in the book
 @cite{Texinfo---The GNU Documentation Format},
 available from the Free Software Foundation,
-and also available @uref{http://www.gnu.org/software/texinfo/manual/texinfo/, online}.)
+and also available @uref{https://www.gnu.org/software/texinfo/manual/texinfo/, online}.)
 @end ifnotinfo
 @ifinfo
 (The Texinfo language is described fully, starting with
@@ -27361,7 +27361,7 @@ certainty through the space-time continuum.
 #! /usr/bin/gawk -f
 
 # From "13.3.11 And Now For Something Completely Different"
-#   http://www.gnu.org/software/gawk/manual/html_node/Signature-Program.html#Signature-Program
+#   https://www.gnu.org/software/gawk/manual/html_node/Signature-Program.html#Signature-Program
 
 # Copyright © 2008 Davide Brini
 
@@ -28389,7 +28389,7 @@ If your system does not have ptys, or if all the system's ptys are in use,
 Using ptys usually avoids the buffer deadlock issues described earlier,
 at some loss in performance. This is because the tty driver buffers
 and sends data line-by-line.  On systems with the @command{stdbuf}
-(part of the @uref{http://www.gnu.org/software/coreutils/coreutils.html,
+(part of the @uref{https://www.gnu.org/software/coreutils/coreutils.html,
 GNU Coreutils package}), you can use that program instead of ptys.
 
 Note also that ptys are not fully transparent. Certain binary control
@@ -28518,7 +28518,7 @@ See
 @end ifinfo
 @ifnotinfo
 See
-@uref{http://www.gnu.org/software/gawk/manual/gawkinet/,
+@uref{https://www.gnu.org/software/gawk/manual/gawkinet/,
 @cite{@value{GAWKINETTITLE}}},
 which comes as part of the @command{gawk} distribution,
 @end ifnotinfo
@@ -29738,7 +29738,7 @@ complete detail in
 @inforef{Top, , GNU @command{gettext} utilities, gettext, GNU @command{gettext} utilities}.)
 @end ifinfo
 @ifnotinfo
-@uref{http://www.gnu.org/software/gettext/manual/,
+@uref{https://www.gnu.org/software/gettext/manual/,
 @cite{GNU @command{gettext} utilities}}.)
 @end ifnotinfo
 As of this writing, the latest version of GNU @command{gettext} is
@@ -29801,7 +29801,7 @@ any complexity.  Thus, most programming languages have facilities available
 for ``debugging'' programs, and now @command{awk} is no exception.
 
 The @command{gawk} debugger is purposely modeled after
-@uref{http://www.gnu.org/software/gdb/, the GNU Debugger (GDB)}
+@uref{https://www.gnu.org/software/gdb/, the GNU Debugger (GDB)}
 command-line debugger.  If you are familiar with GDB, learning
 how to use @command{gawk} for debugging your program is easy.
 
@@ -32434,7 +32434,7 @@ and describes the @code{gawkextlib} project.
 goals and design.
 @end ifclear
 @ifset FOR_PRINT
-See @uref{http://www.gnu.org/software/gawk/manual/html_node/Extension-Design.html}
+See @uref{https://www.gnu.org/software/gawk/manual/html_node/Extension-Design.html}
 for a discussion of the extension mechanism
 goals and design.
 @end ifset
@@ -36709,11 +36709,11 @@ You will need to have the @uref{http://expat.sourceforge.net, Expat}
 XML parser library installed in order to build and use the XML extension.
 
 In addition, you must have the GNU Autotools installed
-(@uref{http://www.gnu.org/software/autoconf, Autoconf},
-@uref{http://www.gnu.org/software/automake, Automake},
-@uref{http://www.gnu.org/software/libtool, Libtool},
+(@uref{https://www.gnu.org/software/autoconf, Autoconf},
+@uref{https://www.gnu.org/software/automake, Automake},
+@uref{https://www.gnu.org/software/libtool, Libtool},
 and
-@uref{http://www.gnu.org/software/gettext, GNU @command{gettext}}).
+@uref{https://www.gnu.org/software/gettext, GNU @command{gettext}}).
 
 The simple recipe for building and testing @code{gawkextlib} is as follows.
 First, build and install @command{gawk}:
@@ -36960,7 +36960,7 @@ find more information.
 To save space, we have omitted
 information on the history of features in @command{gawk} from this
 edition. You can find it in the
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Feature-History.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Feature-History.html,
 online documentation}.
 @end ifset
 
@@ -38816,13 +38816,13 @@ If you have the @command{wget} program, you can use a command like
 the following:
 
 @example
-wget http://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
+wget https://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
 @end example
 @end itemize
 
 The GNU software archive is mirrored around the world.
 The up-to-date list of mirror sites is available from
-@uref{http://www.gnu.org/order/ftp.html, the main FSF website}.
+@uref{https://www.gnu.org/order/ftp.html, the main FSF website}.
 Try to use one of the mirrors; they
 will be less busy, and you can usually find one closer to your site.
 
@@ -39111,7 +39111,7 @@ is generated automatically using GNU Autoconf.
 described fully in
 @cite{Autoconf---Generating Automatic Configuration Scripts},
 which can be found online at
-@uref{http://www.gnu.org/software/autoconf/manual/index.html,
+@uref{https://www.gnu.org/software/autoconf/manual/index.html,
 the Free Software Foundation's website}.)
 @end ifnotinfo
 @ifinfo
@@ -40296,12 +40296,18 @@ The @command{gawk} distribution is available from the GNU Project's main
 distribution site, @code{ftp.gnu.org}.  The canonical build recipe is:
 
 @example
-wget http://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
+wget https://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
 tar -xvpzf gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
 cd gawk-@value{VERSION}.@value{PATCHLEVEL}
 ./configure && make && make check
 @end example
 
+@quotation NOTE
+Because of the @samp{https://} URL, you may have to supply the
+@option{--no-check-certificate} option to @command{wget} to download
+the file.
+@end quotation
+
 @item
 @command{gawk} may be built on non-POSIX systems as well. The currently
 supported systems are MS-Windows using
@@ -40416,7 +40422,7 @@ firewall that does not allow you to use the Git native protocol, you
 can still access the repository using:
 
 @example
-git clone http://git.savannah.gnu.org/r/gawk.git
+git clone https://git.savannah.gnu.org/r/gawk.git
 @end example
 
 Once you have made changes, you can use @samp{git diff} to produce a
@@ -40476,7 +40482,7 @@ This document describes how GNU software should be written. If you haven't
 read it, please do so, preferably @emph{before} starting to modify @command{gawk}.
 (The @cite{GNU Coding Standards} are available from
 the GNU Project's
-@uref{http://www.gnu.org/prep/standards/, website}.
+@uref{https://www.gnu.org/prep/standards/, website}.
 Texinfo, Info, and DVI versions are also available.)
 
 @cindex @command{gawk}, coding style in
@@ -40866,13 +40872,19 @@ Installing from source is quite easy. It's how the maintainer worked for years
 He had @file{/usr/local/bin} at the front of his @env{PATH} and just did:
 
 @example
-wget http://ftp.gnu.org/gnu/@var{package}/@var{package}-@var{x}.@var{y}.@var{z}.tar.gz
+wget https://ftp.gnu.org/gnu/@var{package}/@var{package}-@var{x}.@var{y}.@var{z}.tar.gz
 tar -xpzvf @var{package}-@var{x}.@var{y}.@var{z}.tar.gz
 cd @var{package}-@var{x}.@var{y}.@var{z}
 ./configure && make && make check
 make install    # as root
 @end example
 
+@quotation NOTE
+Because of the @samp{https://} URL, you may have to supply the
+@option{--no-check-certificate} option to @command{wget} to download
+the file.
+@end quotation
+
 @c @item
 @ignore
 These days the maintainer uses Ubuntu 12.04 which is medium current, but
@@ -40918,7 +40930,7 @@ Fortunately, the Git server can meet this need. For any given
 branch named @var{branchname}, use:
 
 @example
-wget http://git.savannah.gnu.org/cgit/gawk.git/snapshot/gawk-@var{branchname}.tar.gz
+wget https://git.savannah.gnu.org/cgit/gawk.git/snapshot/gawk-@var{branchname}.tar.gz
 @end example
 
 @noindent
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 46eed243..2a30a876 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -59,7 +59,7 @@
 @c applies to and all the info about who's publishing this edition
 
 @c These apply across the board.
-@set UPDATE-MONTH August, 2017
+@set UPDATE-MONTH September, 2017
 @set VERSION 4.2
 @set PATCHLEVEL 0
 
@@ -277,7 +277,7 @@ Boston, MA  02110-1301 USA
 Phone: +1-617-542-5942
 Fax: +1-617-542-2652
 Email: <email>gnu@@gnu.org</email>
-URL: <ulink url="http://www.gnu.org">http://www.gnu.org/</ulink></literallayout>
+URL: <ulink url="https://www.gnu.org">https://www.gnu.org/</ulink></literallayout>
 
 <literallayout class="normal">Copyright &copy; 1989, 1991, 1992, 1993, 1996&ndash;2005, 2007, 2009&ndash;2017
 Free Software Foundation, Inc.
@@ -307,7 +307,7 @@ A copy of the license is included in the section entitled
 @ifset FOR_PRINT
 A copy of the license
 may be found on the Internet at
-@uref{http://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
 the GNU Project's website}.
 @end ifset
 
@@ -359,7 +359,7 @@ Boston, MA  02110-1301 USA @*
 Phone: +1-617-542-5942 @*
 Fax: +1-617-542-2652 @*
 Email: @email{gnu@@gnu.org} @*
-URL: @uref{http://www.gnu.org/} @*
+URL: @uref{https://www.gnu.org/} @*
 
 @c This one is correct for gawk 3.1.0 from the FSF
 ISBN 1-882114-28-0 @*
@@ -1546,7 +1546,7 @@ This @value{DOCUMENT} has the difficult task of being both a tutorial and a refe
 If you are a novice, feel free to skip over details that seem too complex.
 You should also ignore the many cross-references; they are for the
 expert user and for the Info and
-@uref{http://www.gnu.org/software/gawk/manual/, HTML}
+@uref{https://www.gnu.org/software/gawk/manual/, HTML}
 versions of the @value{DOCUMENT}.
 @end ifnotinfo
 
@@ -1756,7 +1756,7 @@ printed edition. You may find them online, as follows:
 
 @itemize @value{BULLET}
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Notes.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Notes.html,
 The appendix on implementation notes}
 describes how to disable @command{gawk}'s extensions, how to contribute
 new code to @command{gawk}, where to find information on some possible
@@ -1764,20 +1764,20 @@ future directions for @command{gawk} development, and the design decisions
 behind the extension API.
 
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Basic-Concepts.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Basic-Concepts.html,
 The appendix on basic concepts}
 provides some very cursory background material for those who
 are completely unfamiliar with computer programming.
 
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Glossary.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Glossary.html,
 The Glossary}
 defines most, if not all, of the significant terms used
 throughout the @value{DOCUMENT}.  If you find terms that you aren't familiar with,
 try looking them up here.
 
 @item
-@uref{http://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/GNU-Free-Documentation-License.html,
 The GNU FDL}
 is the license that covers this @value{DOCUMENT}.
 @end itemize
@@ -1793,7 +1793,7 @@ omitted from the print edition but are available online.
 @unnumberedsec Typographical Conventions
 
 @cindex Texinfo
-This @value{DOCUMENT} is written in @uref{http://www.gnu.org/software/texinfo/, Texinfo},
+This @value{DOCUMENT} is written in @uref{https://www.gnu.org/software/texinfo/, Texinfo},
 the GNU documentation formatting language.
 A single Texinfo source file is used to produce both the printed and online
 versions of the documentation.
@@ -1940,9 +1940,9 @@ for your reference
 @end ifclear
 The GPL applies to the C language source code for @command{gawk}.
 To find out more about the FSF and the GNU Project online,
-see @uref{http://www.gnu.org, the GNU Project's home page}.
+see @uref{https://www.gnu.org, the GNU Project's home page}.
 This @value{DOCUMENT} may also be read from
-@uref{http://www.gnu.org/software/gawk/manual/, GNU's website}.
+@uref{https://www.gnu.org/software/gawk/manual/, GNU's website}.
 
 @ifclear FOR_PRINT
 A shell, an editor (Emacs), highly portable optimizing C, C++, and
@@ -2028,7 +2028,7 @@ you should first look at the @file{NEWS} file in the @command{gawk}
 distribution, which provides a high-level summary of the changes in
 each release.
 
-You can then look at the @uref{http://www.gnu.org/software/gawk/manual/,
+You can then look at the @uref{https://www.gnu.org/software/gawk/manual/,
 online version} of this @value{DOCUMENT} to read about any new features.
 @end ifset
 
@@ -3926,7 +3926,7 @@ that pass arguments through the URL; using this option prevents a malicious
 code (via @option{-e}) to the CGI application.@footnote{For more detail,
 please see Section 4.4 of @uref{http://www.ietf.org/rfc/rfc3875,
 RFC 3875}. Also see the
-@uref{http://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html,
+@uref{https://lists.gnu.org/archive/html/bug-gawk/2014-11/msg00022.html,
 explanatory note sent to the @command{gawk} bug
 mailing list}.}
 This option should be used
@@ -4443,7 +4443,7 @@ again after adding the suffix @samp{.awk} to the @value{FN}.
 
 @command{gawk}'s path search mechanism is similar
 to the shell's.
-(See @uref{http://www.gnu.org/software/bash/manual/,
+(See @uref{https://www.gnu.org/software/bash/manual/,
 @cite{The Bourne-Again SHell manual}}.)
 It treats a null entry in the path as indicating the current
 directory.
@@ -25386,7 +25386,7 @@ them in by hand.  Here we present a program that can extract parts of a
 Texinfo input file into separate files.
 
 @cindex Texinfo
-This @value{DOCUMENT} is written in @uref{http://www.gnu.org/software/texinfo/, Texinfo},
+This @value{DOCUMENT} is written in @uref{https://www.gnu.org/software/texinfo/, Texinfo},
 the GNU Project's document formatting language.
 A single Texinfo source file can be used to produce both
 printed documentation, with @TeX{}, and online documentation.
@@ -25394,7 +25394,7 @@ printed documentation, with @TeX{}, and online documentation.
 (Texinfo is fully documented in the book
 @cite{Texinfo---The GNU Documentation Format},
 available from the Free Software Foundation,
-and also available @uref{http://www.gnu.org/software/texinfo/manual/texinfo/, online}.)
+and also available @uref{https://www.gnu.org/software/texinfo/manual/texinfo/, online}.)
 @end ifnotinfo
 @ifinfo
 (The Texinfo language is described fully, starting with
@@ -26375,7 +26375,7 @@ certainty through the space-time continuum.
 #! /usr/bin/gawk -f
 
 # From "13.3.11 And Now For Something Completely Different"
-#   http://www.gnu.org/software/gawk/manual/html_node/Signature-Program.html#Signature-Program
+#   https://www.gnu.org/software/gawk/manual/html_node/Signature-Program.html#Signature-Program
 
 # Copyright © 2008 Davide Brini
 
@@ -27403,7 +27403,7 @@ If your system does not have ptys, or if all the system's ptys are in use,
 Using ptys usually avoids the buffer deadlock issues described earlier,
 at some loss in performance. This is because the tty driver buffers
 and sends data line-by-line.  On systems with the @command{stdbuf}
-(part of the @uref{http://www.gnu.org/software/coreutils/coreutils.html,
+(part of the @uref{https://www.gnu.org/software/coreutils/coreutils.html,
 GNU Coreutils package}), you can use that program instead of ptys.
 
 Note also that ptys are not fully transparent. Certain binary control
@@ -27532,7 +27532,7 @@ See
 @end ifinfo
 @ifnotinfo
 See
-@uref{http://www.gnu.org/software/gawk/manual/gawkinet/,
+@uref{https://www.gnu.org/software/gawk/manual/gawkinet/,
 @cite{@value{GAWKINETTITLE}}},
 which comes as part of the @command{gawk} distribution,
 @end ifnotinfo
@@ -28752,7 +28752,7 @@ complete detail in
 @inforef{Top, , GNU @command{gettext} utilities, gettext, GNU @command{gettext} utilities}.)
 @end ifinfo
 @ifnotinfo
-@uref{http://www.gnu.org/software/gettext/manual/,
+@uref{https://www.gnu.org/software/gettext/manual/,
 @cite{GNU @command{gettext} utilities}}.)
 @end ifnotinfo
 As of this writing, the latest version of GNU @command{gettext} is
@@ -28815,7 +28815,7 @@ any complexity.  Thus, most programming languages have facilities available
 for ``debugging'' programs, and now @command{awk} is no exception.
 
 The @command{gawk} debugger is purposely modeled after
-@uref{http://www.gnu.org/software/gdb/, the GNU Debugger (GDB)}
+@uref{https://www.gnu.org/software/gdb/, the GNU Debugger (GDB)}
 command-line debugger.  If you are familiar with GDB, learning
 how to use @command{gawk} for debugging your program is easy.
 
@@ -31448,7 +31448,7 @@ and describes the @code{gawkextlib} project.
 goals and design.
 @end ifclear
 @ifset FOR_PRINT
-See @uref{http://www.gnu.org/software/gawk/manual/html_node/Extension-Design.html}
+See @uref{https://www.gnu.org/software/gawk/manual/html_node/Extension-Design.html}
 for a discussion of the extension mechanism
 goals and design.
 @end ifset
@@ -35723,11 +35723,11 @@ You will need to have the @uref{http://expat.sourceforge.net, Expat}
 XML parser library installed in order to build and use the XML extension.
 
 In addition, you must have the GNU Autotools installed
-(@uref{http://www.gnu.org/software/autoconf, Autoconf},
-@uref{http://www.gnu.org/software/automake, Automake},
-@uref{http://www.gnu.org/software/libtool, Libtool},
+(@uref{https://www.gnu.org/software/autoconf, Autoconf},
+@uref{https://www.gnu.org/software/automake, Automake},
+@uref{https://www.gnu.org/software/libtool, Libtool},
 and
-@uref{http://www.gnu.org/software/gettext, GNU @command{gettext}}).
+@uref{https://www.gnu.org/software/gettext, GNU @command{gettext}}).
 
 The simple recipe for building and testing @code{gawkextlib} is as follows.
 First, build and install @command{gawk}:
@@ -35974,7 +35974,7 @@ find more information.
 To save space, we have omitted
 information on the history of features in @command{gawk} from this
 edition. You can find it in the
-@uref{http://www.gnu.org/software/gawk/manual/html_node/Feature-History.html,
+@uref{https://www.gnu.org/software/gawk/manual/html_node/Feature-History.html,
 online documentation}.
 @end ifset
 
@@ -37830,13 +37830,13 @@ If you have the @command{wget} program, you can use a command like
 the following:
 
 @example
-wget http://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
+wget https://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
 @end example
 @end itemize
 
 The GNU software archive is mirrored around the world.
 The up-to-date list of mirror sites is available from
-@uref{http://www.gnu.org/order/ftp.html, the main FSF website}.
+@uref{https://www.gnu.org/order/ftp.html, the main FSF website}.
 Try to use one of the mirrors; they
 will be less busy, and you can usually find one closer to your site.
 
@@ -38125,7 +38125,7 @@ is generated automatically using GNU Autoconf.
 described fully in
 @cite{Autoconf---Generating Automatic Configuration Scripts},
 which can be found online at
-@uref{http://www.gnu.org/software/autoconf/manual/index.html,
+@uref{https://www.gnu.org/software/autoconf/manual/index.html,
 the Free Software Foundation's website}.)
 @end ifnotinfo
 @ifinfo
@@ -39310,12 +39310,18 @@ The @command{gawk} distribution is available from the GNU Project's main
 distribution site, @code{ftp.gnu.org}.  The canonical build recipe is:
 
 @example
-wget http://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
+wget https://ftp.gnu.org/gnu/gawk/gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
 tar -xvpzf gawk-@value{VERSION}.@value{PATCHLEVEL}.tar.gz
 cd gawk-@value{VERSION}.@value{PATCHLEVEL}
 ./configure && make && make check
 @end example
 
+@quotation NOTE
+Because of the @samp{https://} URL, you may have to supply the
+@option{--no-check-certificate} option to @command{wget} to download
+the file.
+@end quotation
+
 @item
 @command{gawk} may be built on non-POSIX systems as well. The currently
 supported systems are MS-Windows using
@@ -39430,7 +39436,7 @@ firewall that does not allow you to use the Git native protocol, you
 can still access the repository using:
 
 @example
-git clone http://git.savannah.gnu.org/r/gawk.git
+git clone https://git.savannah.gnu.org/r/gawk.git
 @end example
 
 Once you have made changes, you can use @samp{git diff} to produce a
@@ -39490,7 +39496,7 @@ This document describes how GNU software should be written. If you haven't
 read it, please do so, preferably @emph{before} starting to modify @command{gawk}.
 (The @cite{GNU Coding Standards} are available from
 the GNU Project's
-@uref{http://www.gnu.org/prep/standards/, website}.
+@uref{https://www.gnu.org/prep/standards/, website}.
 Texinfo, Info, and DVI versions are also available.)
 
 @cindex @command{gawk}, coding style in
@@ -39880,13 +39886,19 @@ Installing from source is quite easy. It's how the maintainer worked for years
 He had @file{/usr/local/bin} at the front of his @env{PATH} and just did:
 
 @example
-wget http://ftp.gnu.org/gnu/@var{package}/@var{package}-@var{x}.@var{y}.@var{z}.tar.gz
+wget https://ftp.gnu.org/gnu/@var{package}/@var{package}-@var{x}.@var{y}.@var{z}.tar.gz
 tar -xpzvf @var{package}-@var{x}.@var{y}.@var{z}.tar.gz
 cd @var{package}-@var{x}.@var{y}.@var{z}
 ./configure && make && make check
 make install    # as root
 @end example
 
+@quotation NOTE
+Because of the @samp{https://} URL, you may have to supply the
+@option{--no-check-certificate} option to @command{wget} to download
+the file.
+@end quotation
+
 @c @item
 @ignore
 These days the maintainer uses Ubuntu 12.04 which is medium current, but
@@ -39932,7 +39944,7 @@ Fortunately, the Git server can meet this need. For any given
 branch named @var{branchname}, use:
 
 @example
-wget http://git.savannah.gnu.org/cgit/gawk.git/snapshot/gawk-@var{branchname}.tar.gz
+wget https://git.savannah.gnu.org/cgit/gawk.git/snapshot/gawk-@var{branchname}.tar.gz
 @end example
 
 @noindent