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-rw-r--r--src/simulation/WallType.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/simulation/WallType.h b/src/simulation/WallType.h
index 06d71ce..bfbd3f2 100644
--- a/src/simulation/WallType.h
+++ b/src/simulation/WallType.h
@@ -9,6 +9,9 @@
#ifndef The_Powder_Toy_WallType_h
#define The_Powder_Toy_WallType_h
+#include "graphics/Graphics.h"
+class VideoBuffer;
+
struct wall_type
{
pixel colour;