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-rw-r--r--posix/regex.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/regex.h b/posix/regex.h
index 0efef36e66..2bca5378a4 100644
--- a/posix/regex.h
+++ b/posix/regex.h
@@ -282,7 +282,7 @@ extern reg_syntax_t re_syntax_options;
    `re_error_msg' table in regex.c.  */
 typedef enum
 {
-#if (_XOPEN_SOURCE - 0) == 500
+#ifdef _XOPEN_SOURCE
   REG_ENOSYS = -1,	/* This will never happen for this implementation.  */
 #endif