To fix the below issue:
make[3]: Entering directory `/home/timesys/factory/build_armv7l-timesys-linux-gnueabihf/ppp-2.4.7/ppp-2.4.7/pppd/plugins/pppol2tp'
install -d -m 755 /usr/lib/pppd/2.4.7
install: cannot change permissions of ‘/usr/lib/pppd/2.4.7’: No such file or directory
make[3]: *** [install] Error 1

---
 pppd/plugins/pppol2tp/Makefile.linux | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pppd/plugins/pppol2tp/Makefile.linux b/pppd/plugins/pppol2tp/Makefile.linux
index 7b988cb..e6ef292 100644
--- a/pppd/plugins/pppol2tp/Makefile.linux
+++ b/pppd/plugins/pppol2tp/Makefile.linux
@@ -6,7 +6,7 @@ INSTALL	= install
 
 #***********************************************************************
 
-DESTDIR = @DESTDIR@
+DESTDIR = $(INSTROOT)@DESTDIR@
 LIBDIR = $(DESTDIR)/lib/pppd/$(VERSION)
 
 VERSION = $(shell awk -F '"' '/VERSION/ { print $$2; }' ../../patchlevel.h)
-- 
2.7.4