diff -uNr lpeg-1.0.2/makefile lpeg-1.0.2.mod/makefile
--- lpeg-1.0.2/makefile	2019-03-11 16:08:29.000000000 +0200
+++ lpeg-1.0.2.mod/makefile	2019-05-10 16:13:05.997196863 +0300
@@ -1,7 +1,7 @@
 LIBNAME = lpeg
 LUADIR = ./lua/
 
-COPT = -O2 -DNDEBUG
+#COPT = -O2 -DNDEBUG
 # COPT = -O0 -DLPEG_DEBUG -g
 
 CWARNS = -Wall -Wextra -pedantic \
@@ -22,7 +22,7 @@
 # -Wunreachable-code \
 
 
-CFLAGS = $(CWARNS) $(COPT) -std=c99 -I$(LUADIR) -fPIC
+CFLAGS += $(CWARNS) $(COPT) -std=c99 -I$(LUADIR) -fPIC
 CC = gcc
 
 FILES = lpvm.o lpcap.o lptree.o lpcode.o lpprint.o
@@ -36,7 +36,7 @@
 	$(MAKE) lpeg.so "DLLFLAGS = -bundle -undefined dynamic_lookup"
 
 lpeg.so: $(FILES)
-	env $(CC) $(DLLFLAGS) $(FILES) -o lpeg.so
+	env $(CC) $(DLLFLAGS) $(FILES) -o lpeg.so $(LDFLAGS)
 
 $(FILES): makefile
 
