-CFLAGS = $(COPTS) $(DEBUG_FLAGS) $(COMPILE_FLAGS)
-SOURCE= RELNOTES Makefile.linux $(PPPDSRCS) $(HEADERS) $(MANPAGES)
+# The INCLUDE_DIRS must include the standard headers before the local
+# ones. If you just had -I.. then the order would be reversed. So, use
+# the default location for include files first before the .. location.
+#INCLUDE_DIRS= -I/usr/include -I..
+INCLUDE_DIRS=
+
+COMPILE_FLAGS= -D_linux_=1 -DHAVE_PATHS_H -DIPX_CHANGE
+
+CFLAGS= $(COPTS) $(COMPILE_FLAGS) $(INCLUDE_DIRS)
+
+ifdef HAS_SHADOW
+CFLAGS += -DHAS_SHADOW
+LIBS += -lshadow
+endif
+
+ifdef USE_PAM
+CFLAGS += -DUSE_PAM
+LIBS += -lpam -ldl
+endif