WIP: fix Makefile

Author: wilhelmliao

Makefile

@@ -4,12 +4,23 @@ RM = rm -f
 CFLAG =  -shared -fPIC
 TARGET = bigdecimal.so
 
+LUA_INCLUDE_DIR ?=
+LUA_LIBRARIES ?=
 BIGDECIMAL_SOURCES = lib/bigdecimal/bigdecimal.cpp
 BIGDECIMAL_INCLUDE_DIR = lib/bigdecimal
 
 BUILD_CFLAGS = $(CFLAG) -I $(BIGDECIMAL_INCLUDE_DIR)
 SOURCE = $(BIGDECIMAL_SOURCES) lua_bigdecimal.c
 
+
+ifneq ($(LUA_INCLUDE_DIR),)
+	BUILD_CFLAGS+= -I $(LUA_INCLUDE_DIR)
+endif
+ifneq ($(LUA_LIBRARIES),)
+	BUILD_CFLAGS+= -L $(LUA_LIBRARIES)
+endif
+
+
 all: $(TARGET)
 
 $(TARGET):