diff --git a/Makefile b/Makefile
index 9e1c0aa..745b573 100644
--- a/Makefile
+++ b/Makefile
@@ -7,11 +7,11 @@ CDEPS    := $(COBJS:.o=.dep)
 CXXDEPS  := $(CXXOBJS:.o=.dep)
 DEPS     := $(CDEPS) $(CXXDEPS)
 
-LUAINCLUDE := $(shell which lua-config >/dev/null 2>&1; if [ $$? == 0 ]; then lua-config --include; fi)
-ifeq ($(strip $(LUA_INCLUDE)),)
+LUAINCLUDE := $(shell which lua-config >/dev/null 2>&1; if [ $$? -eq 0 ]; then lua-config --include; fi)
+ifeq ($(strip $(LUAINCLUDE)),)
 LUAINCLUDE := -I/usr/include/lua5.1
 endif
-LUALIBS  := $(shell which lua-config >/dev/null 2>&1; if [ $$? == 0 ]; then lua-config --libs; fi)
+LUALIBS  := $(shell which lua-config >/dev/null 2>&1; if [ $$? -eq 0 ]; then lua-config --libs; fi)
 ifeq ($(strip $(LUALIBS)),)
 LUALIBS  := -llua5.1
 endif