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+?RCS: $Id: d_regcomp.U 167 2013-05-08 17:58:00Z rmanfredi $
+?RCS: Copyright (c) 2011, Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic License,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?MAKE:d_regcomp: Trylink cat
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_REGCOMP symbol, which
+?S: indicates to the C program that the regcomp() routine is available
+?S: for regular patern matching (usally on POSIX.2 conforming systems).
+?C: This symbol, if defined, indicates that the regcomp() routine is
+?C: available to do some regular patern matching (usually on POSIX.2
+?C: conforming systems).
+?C: When regcomp() exists, it is safe to assume regexec() and regfree()
+?C: are also available.
+?H:#$d_regcomp HAS_REGCOMP /**/
+: see if regcomp exists
+$cat >try.c <<EOC
+ int ret = 0;
+ regex_t re;
+ ret |= regcomp(&re, ".",
+ REG_EXTENDED | REG_NOSUB | REG_ICASE | REG_NEWLINE);
+ return ret ? 0 : 1;