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-rw-r--r--posix/glob.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/glob.h b/posix/glob.h
index 0b7808b15c..5a8e48c196 100644
--- a/posix/glob.h
+++ b/posix/glob.h
@@ -84,7 +84,7 @@ extern "C" {
    `glob'.  Since this is not the case here it will never be
    returned but the conformance test suites still require the symbol
    to be defined.  */
-#if (_XOPEN_SOURCE - 0) == 500
+#ifdef _XOPEN_SOURCE
 # define GLOB_NOSYS	(-1)
 #endif