diff -Nurbs acpica-unix-20121114.orig/generate/unix/Makefile.common acpica-unix-20121114/generate/unix/Makefile.common
--- acpica-unix-20121114.orig/generate/unix/Makefile.common	2012-11-15 00:22:38.000000000 +0800
+++ acpica-unix-20121114/generate/unix/Makefile.common	2013-02-09 12:11:55.994133871 +0800
@@ -19,17 +19,17 @@
 	if [ $(BITS) -eq 32 ]; then \
 		echo "Forced 32-bit generation of $@"; \
 		mkdir -p obj32; \
-		make BITS=32; \
+		$(MAKE) BITS=32; \
 		echo "32-bit version of $@:"; \
 		ls -al ../bin32/$@; \
 	elif [ $(findstring 64,$(HARDWARE_NAME)) ]; then \
 		mkdir -p obj64; \
-		make BITS=64; \
+		$(MAKE) BITS=64; \
 		echo "64-bit version of $@:"; \
 		ls -al ../bin64/$@; \
 	else \
 		mkdir -p obj32; \
-		make BITS=32; \
+		$(MAKE) BITS=32; \
 		echo "32-bit version of $@:"; \
 		ls -al ../bin32/$@; \
 	fi;
@@ -47,7 +47,7 @@
 		(cd $(BUILD_DIRECTORY_PATH)/$$toolname; \
 		pwd; \
 		mkdir -p obj32; \
-		make BITS=32; \
+		$(MAKE) BITS=32; \
 		echo "32-bit version of $$toolname:"; \
 		ls -al obj32/$$toolname \
 		); \
@@ -61,7 +61,7 @@
 		(cd $(BUILD_DIRECTORY_PATH)/$$toolname; \
 		pwd; \
 		mkdir -p obj64; \
-		make BITS=64; \
+		$(MAKE) BITS=64; \
 		echo "64-bit version of $$toolname:"; \
 		ls -al obj64/$$toolname \
 		); \
@@ -73,11 +73,11 @@
 		echo "Removing $$toolname"; \
 		pwd; \
 		if [ -d "obj32" ] ; then \
-			make BITS=32 clean; \
+			$(MAKE) BITS=32 clean; \
 			rmdir obj32; \
 		fi; \
 		if [ -d "obj64" ] ; then \
-			make BITS=64 clean; \
+			$(MAKE) BITS=64 clean; \
 			rmdir obj64; \
 		fi; \
 		echo ""; \
@@ -92,10 +92,10 @@
 		(cd $(BUILD_DIRECTORY_PATH)/$$toolname; \
 		pwd; \
 		if [ $(findstring 64,$(HARDWARE_NAME)) ]; then \
-			make BITS=64 PROG=$$toolname install; \
+			$(MAKE) BITS=64 PROG=$$toolname install; \
 			echo "Installed 64-bit version of $$toolname"; \
 		else \
-			make BITS=32 PROG=$$toolname install; \
+			$(MAKE) BITS=32 PROG=$$toolname install; \
 			echo "Installed 32-bit version of $$toolname"; \
 		fi; \
 		echo ""; \