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-rw-r--r--src/learn-your-telephone-number.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/learn-your-telephone-number.c b/src/learn-your-telephone-number.c
index 6b5dc44..6540feb 100644
--- a/src/learn-your-telephone-number.c
+++ b/src/learn-your-telephone-number.c
@@ -19,6 +19,7 @@
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
+#define _DEFAULT_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>