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-rw-r--r--src/heretic/r_plane.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/heretic/r_plane.c b/src/heretic/r_plane.c
index bb694dd2..28c109a4 100644
--- a/src/heretic/r_plane.c
+++ b/src/heretic/r_plane.c
@@ -24,6 +24,7 @@
#include <stdlib.h>
#include "doomdef.h"
+#include "i_system.h"
#include "r_local.h"
planefunction_t floorfunc, ceilingfunc;