Compiling GTK, GLIB,PANGO ???

["gtk rapp-informatik de" <gtk rapp-informatik de>]

Sorry I don't know if this is the right mailing list.

I want to install the newest versions of GDK ; GLIB PANGO   etc.
for testing purpose.  I do not want to overwrite the existing
libraries of my SuSE 10.1 installation to be sure not to damage the 
whole system
I thought to do
first I build glib with
configure --prefix=/opt/glib
this works fine
than I tried to
configure --prefix=/opt/gtk as an example
now configure complains about the not up todate  glib version
because I know  pkgconfig uses the PKG_CONFIG_PATH
what can I do to force configure to test against the 
/opt/glib/lib/pkgconfig  Path

Suggestions to do wellcome

mfg
g.rapp

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