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-rw-r--r--posix/regex.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/posix/regex.h b/posix/regex.h
index 22d316b0f1..44f6b557b6 100644
--- a/posix/regex.h
+++ b/posix/regex.h
@@ -282,6 +282,10 @@ extern reg_syntax_t re_syntax_options;
    `re_error_msg' table in regex.c.  */
 typedef enum
 {
+#if (_XOPEN_SOURCE - 0) == 500
+  REG_NOSYS = -1,	/* This will never happen for this implementation.  */
+#endif
+
   REG_NOERROR = 0,	/* Success.  */
   REG_NOMATCH,		/* Didn't find a match (for regexec).  */