--- lpeg-0.12/makefile
+++ lpeg-0.12/makefile
@@ -1,7 +1,7 @@
 LIBNAME = lpeg
 LUADIR = /usr/include/lua5.1/
 
-COPT = -O2
+#COPT = -O2
 # COPT = -DLPEG_DEBUG -g
 
 CWARNS = -Wall -Wextra -pedantic \
@@ -22,21 +22,21 @@
 # -Wunreachable-code \
 
 
-CFLAGS = $(CWARNS) $(COPT) -ansi -I$(LUADIR) -fPIC
+CFLAGS += $(CWARNS) $(COPT) -ansi -I$(LUADIR) -fPIC
 CC = gcc
 
 FILES = lpvm.o lpcap.o lptree.o lpcode.o lpprint.o
 
 # For Linux
 linux:
-	make lpeg.so "DLLFLAGS = -shared -fPIC"
+	$(MAKE) lpeg.so "DLLFLAGS = -shared -fPIC"
 
 # For Mac OS
 macosx:
-	make lpeg.so "DLLFLAGS = -bundle -undefined dynamic_lookup"
+	$(MAKE) lpeg.so "DLLFLAGS = -bundle -undefined dynamic_lookup"
 
 lpeg.so: $(FILES)
-	env $(CC) $(DLLFLAGS) $(FILES) -o lpeg.so
+	env $(CC) $(CFLAGS) $(DLLFLAGS) $(LDFLAGS) $(FILES) -o lpeg.so
 
 $(FILES): makefile