build: avoid redefining _DEFAULT_SOURCE

Work around further glibc toolchain annoyances.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 4 insertions, 1 deletions

diff --git a/main.c b/main.c
index 6574c15..219e37e 100644
--- a/main.c
+++ b/main.c
@@ -17,7 +17,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#define _DEFAULT_SOURCE
+#ifndef _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE
+#endif
+
 #define _BSD_SOURCE
 #define _GNU_SOURCE
 #define _XOPEN_SOURCE	700