Description: some apps use REG_NOERROR. Found in xfig
Index: b/usr/src/head/regex.h
===================================================================
--- a/usr/src/head/regex.h
+++ b/usr/src/head/regex.h
@@ -102,6 +102,7 @@ typedef ssize_t regoff_t;
 
 /* regcomp and regexec return codes */
 #define	REG_OK		0		/* success (non-standard) */
+#define	REG_NOERROR	0		/* success (non-standard) */
 #define	REG_NOMATCH	1		/* regexec failed to match */
 #define	REG_ECOLLATE	2		/* invalid collation element ref. */
 #define	REG_EESCAPE	3		/* trailing \ in pattern */