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--- makefile.orig	2023-06-26 16:30:55 UTC
+++ makefile
@@ -1,5 +1,5 @@
 LIBNAME = lpeg
-LUADIR = ./lua/
+LUADIR ?= ./lua/
 
 COPT = -O2 -DNDEBUG
 # COPT = -O0 -DLPEG_DEBUG -g
@@ -25,8 +25,8 @@ CWARNS = -Wall -Wextra -pedantic \
 # -Wunreachable-code \
 
 
-CFLAGS = $(CWARNS) $(COPT) -std=c99 -I$(LUADIR) -fPIC
-CC = gcc
+CFLAGS += $(CWARNS) $(COPT) -std=c99 -I$(LUADIR) -fPIC
+CC ?= gcc
 
 FILES = lpvm.o lpcap.o lptree.o lpcode.o lpprint.o lpcset.o