diff --git a/config.mk b/config.mk
index 5cad7038..f21b9aee 100644
--- a/config.mk
+++ b/config.mk
@@ -4,6 +4,7 @@ VERSION ?= ${shell git describe --dirty}
 app ?= 0
 curl ?= 1
 debug ?= 0
+glibc ?= 0
 exif ?= 0
 help ?= 0
 magic ?= 0
@@ -57,6 +58,10 @@ else
 	MAN_DEBUG = .
 endif
 
+ifeq (${glibc},1)
+	CFLAGS += -DHAVE_GNU
+endif
+
 ifeq (${help},1)
 	CFLAGS += -DINCLUDE_HELP
 endif
diff --git a/src/imlib.c b/src/imlib.c
index eb3f5224..259e45f6 100644
--- a/src/imlib.c
+++ b/src/imlib.c
@@ -24,6 +24,14 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 */
 
+/*
+ * mkstemps(3) is a nonstandard extension that requires defining
+ * _GNU_SOURCE for glibc
+ */
+#ifdef HAVE_GNU
+#define _GNU_SOURCE
+#endif
+
 #include "feh.h"
 #include "filelist.h"
 #include "signals.h"