clipboard_x11.c: define _POSIX_SOURCE

jtanx · jtanx · commit 5faa01922ce7 · 2018-05-26T08:41:28.000+08:00
Fixes #10
diff --git a/src/clipboard_x11.c b/src/clipboard_x11.c
@@ -7,6 +7,8 @@
  *             See LICENSE for details.
  */
 
+#define _POSIX_C_SOURCE 199309L
+
 #include "libclipboard.h"
 
 #ifdef LIBCLIPBOARD_BUILD_X11
