$NetBSD: patch-Makefile,v 1.1 2023/07/09 08:37:39 nia Exp $

Honour CFLAGS/LDFLAGS. Hopefully fixes building on platforms where zlib
is installed from pkgsrc.

--- Makefile.orig	2021-12-26 20:14:54.000000000 +0000
+++ Makefile
@@ -1,4 +1,4 @@
-CFLAGS=		-g -Wall -O2 -Wc++-compat #-Wextra
+CFLAGS+=	-Wall -Wc++-compat #-Wextra
 CPPFLAGS=	-DHAVE_KALLOC
 INCLUDES=
 OBJS=		kthread.o kalloc.o misc.o bseq.o sketch.o sdust.o options.o index.o \
@@ -45,10 +45,10 @@ all:$(PROG)
 extra:all $(PROG_EXTRA)
 
 minimap2:main.o libminimap2.a
-		$(CC) $(CFLAGS) main.o -o $@ -L. -lminimap2 $(LIBS)
+		$(CC) $(LDFLAGS) main.o -o $@ -L. -lminimap2 $(LIBS)
 
 minimap2-lite:example.o libminimap2.a
-		$(CC) $(CFLAGS) $< -o $@ -L. -lminimap2 $(LIBS)
+		$(CC) $(LDFLAGS) $< -o $@ -L. -lminimap2 $(LIBS)
 
 libminimap2.a:$(OBJS)
 		$(AR) -csru $@ $(OBJS)