I downloaded ppp-2.4.2 from internet and wanted to compile it by arm-linux-gcc. So I changed the Makefile of the ppp-2.4.2, I declared such line:
CC = /usr/local/arm-linux/bin/arm-linux-gcc
In the bottom directory rp-pppoe,the Makefile has such line:
$(CC) '-DRP-VERSION="$VERSION)"' $(CFLAGS) -I../../.. -c -o plugin.o -fPIC plugin.c
and CFLAGS = -O2 -g -I../../../include/linux
when I tried to compile it ,many errors happened. The upper Makefile was changed to this:
/usr/local/arm-linux/bin/arm-linux-gcc '-DRP-VERSION="3.3"' -O2 -g -I../../../include/linux -I../../.. -c -o plugin.o -fPIC plugin.c
In file included from /usr/local/arm-linux/lib/gcc/arm-linux/3.4.3/../../../../arm-linux/sys-include/linux/ppp_defs.h:8
why occur such things? I think -I../../.. is in the directory ppp-2.4.2,but why come to arm-linux-gcc directory? Anybody can help me? thanks

You're saying that when you compiled it, it used:

/usr/local/arm-linux/bin/arm-linux-gcc '-DRP-VERSION="3.3"' -O2 -g -I../../../include/linux -I../../.. -c -o plugin.o -fPIC plugin.c

That's ok, that's good actually

CC = /usr/local/arm-linux/bin/arm-linux-gcc
Is a variable declaration, $(CC) will dereference it and stick it right before your statement.

So you're telling it to look at the arm-linux gcc, that's why it is

sorry,I can't know exactly what you mean,so please re-explain it again and tell me how to do,thanks.