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-rw-r--r--src/heretic/p_sight.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/heretic/p_sight.c b/src/heretic/p_sight.c
index 7e589368..257c784b 100644
--- a/src/heretic/p_sight.c
+++ b/src/heretic/p_sight.c
@@ -22,6 +22,8 @@
//-----------------------------------------------------------------------------
// P_sight.c
+#include <stdlib.h>
+
#include "doomdef.h"
#include "p_local.h"