Include <ctype.h>.

diff --git a/src/image.c b/src/image.c
index 3c53903b4b4cf88e9bf5fd3ae93b186a317064e1..41762030b9ee818f22af050a2df3bbe1d345b669 100644 (file)
--- a/src/image.c
+++ b/src/image.c
@@ -23,6 +23,7 @@ Boston, MA 02111-1307, USA.  */
 #include <signal.h>
 #include <stdio.h>
 #include <math.h>
+#include <ctype.h>
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>