+ifneq ($(wildcard /usr/include/crypt.h),)
+CFLAGS += -DHAVE_CRYPT_H=1
+LIBS += -lcrypt
+endif
+
+ifdef USE_LIBUTIL
+CFLAGS += -DHAVE_LOGWTMP=1
+LIBS += -lutil
+endif
+
+ifdef NEEDDES
+ifndef USE_CRYPT
+LIBS += -ldes $(LIBS)
+else
+CFLAGS += -DUSE_CRYPT=1
+endif
+PPPDOBJS += pppcrypt.o
+HEADERS += pppcrypt.h
+endif
+
+# For "Pluggable Authentication Modules", see ftp.redhat.com:/pub/pam/.
+ifdef USE_PAM
+CFLAGS += -DUSE_PAM
+LIBS += -lpam -ldl
+endif
+
+# Multi-linnk
+ifdef HAVE_MULTILINK
+ # Multilink implies the use of TDB
+ USE_TDB=y
+
+ CFLAGS += -DHAVE_MULTILINK
+ PPPDSRCS += multilink.c
+ PPPDOBJS += multilink.o
+endif
+
+# TDB
+ifdef USE_TDB
+ CFLAGS += -DUSE_TDB=1
+ PPPDSRCS += tdb.c spinlock.c
+ PPPDOBJS += tdb.o spinlock.o
+ HEADERS += tdb.h spinlock.h
+endif
+
+# Lock library binary for Linux is included in 'linux' subdirectory.
+ifdef LOCKLIB
+LIBS += -llock
+CFLAGS += -DLOCKLIB=1
+endif
+
+ifdef PLUGIN
+CFLAGS += -DPLUGIN
+LDFLAGS += -Wl,-E
+LIBS += -ldl
+endif
+
+ifdef FILTER
+ifneq ($(wildcard /usr/include/pcap-bpf.h),)
+LIBS += -lpcap
+CFLAGS += -DPPP_FILTER
+endif
+endif
+
+ifdef HAVE_INET6
+ PPPDSRCS += ipv6cp.c eui64.c
+ HEADERS += ipv6cp.h eui64.h
+ PPPDOBJS += ipv6cp.o eui64.o
+ CFLAGS += -DINET6=1
+endif
+
+ifdef CBCP
+ PPPDSRCS += cbcp.c
+ PPPDOBJS += cbcp.o
+ CFLAGS += -DCBCP_SUPPORT
+ HEADERS += cbcp.h
+endif
+
+ifdef MAXOCTETS
+ CFLAGS += -DMAXOCTETS
+endif
+
+INSTALL= install
+
+all: $(TARGETS)
+