I can't change environment variable pkg-config-path on a live CD knoppix.
It works on both my Debian boxes but being a read-only system I can't
make it stick on knoppix.

I have installed newer atk, glib and gtk versions and had to ./configure --prefix=$HOME directory.
They install fine, except gtk which depends on atk >= 1.2.1.
I have tried env -i pkg-config-path="/home/knoppix/lib/pkgconfig" and it seems to finish without error
but afterward the pkg-config --list-all does not show the updated version or path.
I even tried them sudo but no joy.

Is there a way to change or add to the environment variables in knoppix that I missed?

thx