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-rw-r--r--lib/libX11/src/config.h.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/libX11/src/config.h.in b/lib/libX11/src/config.h.in
index af45e2fd3..80093dd12 100644
--- a/lib/libX11/src/config.h.in
+++ b/lib/libX11/src/config.h.in
@@ -173,3 +173,6 @@
/* Whether libX11 needs to use MT safe API's */
#undef XUSE_MTSAFE_API
+
+/* Enable GNU and other extensions to the C environment for glibc */
+#undef _GNU_SOURCE