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-rw-r--r--crawl-ref/source/defines.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/crawl-ref/source/defines.h b/crawl-ref/source/defines.h
index 42f083ffb6..9bea7f9c65 100644
--- a/crawl-ref/source/defines.h
+++ b/crawl-ref/source/defines.h
@@ -289,5 +289,6 @@ enum mouse_mode
MOUSE_MODE_MACRO
};
+#define PI 3.14159265359f
#endif