diff --git a/makefile.gcc b/makefile.gcc
index f437693df..61095a737 100644
--- a/makefile.gcc
+++ b/makefile.gcc
@@ -13,8 +13,10 @@ CFLAGS += -Wall -I. -Isrc -Ithird_party		\
 	  -I$(ZLIB_DIR)				\
 	  -I$(LOADPNG_DIR)			\
 	  -I$(TINYXML_DIR)			\
+	  -I$(VACA_DIR)/include			\
 	  -Wno-deprecated-declarations		\
-	  -DPNG_NO_MMX_CODE
+	  -DPNG_NO_MMX_CODE			\
+	  -DVACA_ALLEGRO
 
 LFLAGS += $(THIRD_PARTY_LIBS)
 
diff --git a/makefile.vc b/makefile.vc
index 1eff1fd7a..54338e713 100644
--- a/makefile.vc
+++ b/makefile.vc
@@ -31,7 +31,9 @@ CFLAGS = -nologo						\
 	 -I$(ZLIB_DIR)						\
 	 -I$(LOADPNG_DIR)					\
 	 -I$(TINYXML_DIR)					\
-	 -DPNG_NO_MMX_CODE
+	 -I$(VACA_DIR)/include					\
+	 -DPNG_NO_MMX_CODE					\
+	 -DVACA_ALLEGRO
 
 LFLAGS = -NOLOGO -SUBSYSTEM:WINDOWS -MACHINE:X86