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-rw-r--r--plugin/auth/CMakeLists.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/plugin/auth/CMakeLists.txt b/plugin/auth/CMakeLists.txt
index 6a9c31f82ce..9a3682a5e96 100644
--- a/plugin/auth/CMakeLists.txt
+++ b/plugin/auth/CMakeLists.txt
@@ -28,7 +28,9 @@ MYSQL_ADD_PLUGIN(qa_auth_client qa_auth_client.c
MODULE_ONLY)
CHECK_CXX_SOURCE_COMPILES(
-"#define _GNU_SOURCE
+"#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
#include <sys/socket.h>
int main() {
struct ucred cred;