1 files changed, 4 insertions, 0 deletions
diff --git a/freecell.c b/freecell.c
index 0b77e6f..a97e3b3 100644
--- a/freecell.c
+++ b/freecell.c
@@ -14,6 +14,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
 #include <assert.h>
 #include <ctype.h>
 #include <curses.h>