From: Marco d'Itri <md@linux.it>
Date: Fri, 2 Jun 2017 11:09:30 +0200
Subject: [PATCH] support building pppdump with the system zlib

---
 pppdump/Makefile.linux | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/pppdump/Makefile.linux b/pppdump/Makefile.linux
index 65e5c14914fb..87777fab5e94 100644
--- a/pppdump/Makefile.linux
+++ b/pppdump/Makefile.linux
@@ -2,18 +2,42 @@ DESTDIR = $(INSTROOT)@DESTDIR@
 BINDIR = $(DESTDIR)/sbin
 MANDIR = $(DESTDIR)/share/man/man8
 
+DO_DEFLATE=y
+DO_BSD_COMPRESS=y
+HAVE_ZLIB=n
+
 COPTS=-O2 -g
 CFLAGS= $(COPTS) -I../include/net
 LDFLAGS=$(LDOPTS)
 
-OBJS = pppdump.o bsd-comp.o deflate.o zlib.o
+OBJS = pppdump.o
+LIBS =
+
+ifdef DO_DEFLATE
+CFLAGS += -DDO_DEFLATE=1
+OBJS += deflate.o
+ifdef HAVE_ZLIB
+LIBS += -lz
+else
+OBJS += zlib.o
+endif
+else
+CFLAGS += -DDO_DEFLATE=0
+endif
+
+ifdef DO_BSD_COMPRESS
+CFLAGS += -DDO_BSD_COMPRESS=1
+OBJS += bsd-comp.o
+else
+CFLAGS += -DDO_BSD_COMPRESS=0
+endif
 
 INSTALL= install
 
 all:	pppdump
 
 pppdump: $(OBJS)
-	$(CC) $(LDFLAGS) -o pppdump $(OBJS)
+	$(CC) $(LDFLAGS) -o pppdump $(OBJS) $(LIBS)
 
 clean:
 	rm -f pppdump $(OBJS) *~