diff --git a/libraries/libmdb/.gitignore b/libraries/libmdb/.gitignore
index 134c457..0d493fe 100644
--- a/libraries/libmdb/.gitignore
+++ b/libraries/libmdb/.gitignore
@@ -1,6 +1,7 @@
 mtest
 mtest[23456]
 testdb
+mdb_copy
 mdb_stat
 *.[ao]
 *.so
diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index b39fbfb..07ecf99 100644
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -32,7 +32,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#define _GNU_SOURCE
+#define _GNU_SOURCE 1
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/param.h>