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-rw-r--r--progs/redbook/checker.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/progs/redbook/checker.c b/progs/redbook/checker.c
index 4b7695237f..06cbae7dd7 100644
--- a/progs/redbook/checker.c
+++ b/progs/redbook/checker.c
@@ -42,6 +42,7 @@
* two rectangles. This program clamps the texture, if
* the texture coordinates fall outside 0.0 and 1.0.
*/
+#include <stdlib.h>
#include <GL/glut.h>
/* Create checkerboard texture */