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+When compiling on DECstation running Ultrix 4.0 a command 'cc -c -O
+regex.c' is causing an infinite loop in an optimizer. Other sources
+compile fine with -O flag. If you are going to use this flag either
+add a special rule to Makefile for a compilation of regex.c, or issue
+'cc -c regex.c' before hitting 'make'.
+
+From: Steve Simmons <scs@wotan.iti.org>
+Subject: Non-bug report on gawk 2.13.2
+To: david@cs.dal.ca, arnold@skeeve.atl.ga.us
+Date: Thu, 25 Jul 1991 13:45:38 -0300
+
+Just fyi -- it passes tests with flying colors under Ultrix 4.2. The
+README.ultrix file applies more than ever. You might want to add
+these paragraphs to it:
+
+ As of Ultrix 4.2 the optimise works for regex.c, but you must give an
+ additional switch to get everything optimised. Using '-Olimit 1500'
+ does the job. Without the switch gawk will compile and run correctly,
+ but you will get complaints about lost optimisations in builtin.c,
+ awk.tab.c and regex.c.