fix Makefile build dir link upgrade bug reported by @jamt9000

jeffdonahue · jeffdonahue · commit 25aa12922c87 · 2014-06-08T18:22:45.000-07:00
diff --git a/Makefile b/Makefile
@@ -297,7 +297,7 @@ $(BUILD_DIR_LINK): $(BUILD_DIR)/.linked
 $(BUILD_DIR)/.linked:
 	@ mkdir -p $(BUILD_DIR)
 	@ $(RM) $(OTHER_BUILD_DIR)/.linked
-	@ $(RM) $(BUILD_DIR_LINK)
+	@ $(RM) -r $(BUILD_DIR_LINK)
 	@ ln -s $(BUILD_DIR) $(BUILD_DIR_LINK)
 	@ touch $@
 
