1 files changed, 6 insertions, 0 deletions
diff --git a/crawl-ref/source/externs.h b/crawl-ref/source/externs.h
index c141eb5e71..303bef9abc 100644
--- a/crawl-ref/source/externs.h
+++ b/crawl-ref/source/externs.h
@@ -22,6 +22,7 @@
 #include <map>
 #include <set>
 #include <memory>
+#include <cstdlib>
 
 #include <time.h>
 
@@ -333,6 +334,11 @@ struct coord_def
     {
         return (x * x + y * y);
     }
+
+    int rdist() const
+    {
+        return (MAXIMUM(::abs(x), ::abs(y)));
+    }
 };
 
 struct dice_def