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-rw-r--r--libc/cbb-common.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libc/cbb-common.h b/libc/cbb-common.h
index 3bbbdfac7..4e408f06f 100644
--- a/libc/cbb-common.h
+++ b/libc/cbb-common.h
@@ -11,7 +11,7 @@ extern "C" {
/* namespace */
#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
+#define _GNU_SOURCE 1
#endif