+# Multi-linnk
+ifdef HAVE_MULTILINK
+ # Multilink implies the use of TDB
+ USE_TDB=y
+
+ CFLAGS += -DHAVE_MULTILINK
+ PPPDSRCS += multilink.c
+ PPPDOBJS += multilink.o
+endif
+
+# TDB
+ifdef USE_TDB
+ CFLAGS += -DUSE_TDB=1
+ PPPDSRCS += tdb.c
+ PPPDOBJS += tdb.o
+endif
+
+# Lock library binary for Linux is included in 'linux' subdirectory.
+ifdef LOCKLIB
+LIBS := -llock $(LIBS)
+CFLAGS += -DLOCKLIB=1
+endif
+
+ifdef PLUGIN
+CFLAGS += -DPLUGIN
+LDFLAGS += -Wl,-E
+LIBS += -ldl
+endif
+
+ifdef FILTER
+LIBS += -lpcap
+CFLAGS += -DPPP_FILTER -I/usr/include/pcap
+endif
+
+ifdef HAVE_INET6
+ PPPDSRCS += ipv6cp.c eui64.c
+ HEADERS += ipv6cp.h eui64.h
+ PPPDOBJS += ipv6cp.o eui64.o
+ CFLAGS += -DINET6=1
+endif
+
+
+INSTALL= install -o root
+
+install: pppd
+ mkdir -p $(BINDIR) $(MANDIR)
+ $(INSTALL) -s -c -m 555 pppd $(BINDIR)/pppd
+ if chgrp pppusers $(BINDIR)/pppd 2>/dev/null; then \
+ chmod o-rx,u+s $(BINDIR)/pppd; fi
+ $(INSTALL) -c -m 444 pppd.8 $(MANDIR)/man8
+
+pppd: $(PPPDOBJS)
+ $(CC) $(CFLAGS) $(LDFLAGS) -o pppd $(PPPDOBJS) $(LIBS)