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+2017-04-20 Arnold D. Robbins <arnold@skeeve.com>
+
+ * configure.ac: Make letter case usage in the various
+ AC_ARG_ENABLE messages consistent with the rest of configure
+ output.
+ (--disable-mpfr): Add this option to make it easier
+ to check compiles without MPFR. Motivated by:
+ * awk.h (NODE): Rearrange the layout of the 'val' subportion
+ of the union to fix alignment problems when compiling without
+ MPFR. The problem only happened on 64-bit compiles, not
+ 32-bit compiles.
+
2017-04-16 Arnold D. Robbins <arnold@skeeve.com>
Rename intdiv it intdiv0 and require enabling at configure time.