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-rw-r--r--src/gtkutil.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/gtkutil.c b/src/gtkutil.c
index 6308c38f164..5e7cf3d2114 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -22,6 +22,7 @@ along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#ifdef USE_GTK
#include <float.h>
#include <stdio.h>
+#include <stdlib.h>
#include <c-ctype.h>