i have rhel 4 , upon installing atk-1.9.1

i get this message

*** 'pkg-config --modversion glib-2.0' returned 2.12.0, but GLIB
*** was found! If pkg-config was correct, then it is best
*** to remove the old version of GLib. You may also be able to fix the
*** by modifying your LD_LIBRARY_PATH enviroment variable, or by
*** /etc/ld.so.conf. Make sure you have run ldconfig if that is
*** required on your system.
*** If pkg-config was wrong, set the environment variable
*** to point to the correct configuration files
configure: error:
*** GLIB 2.5.7 or better is required. The latest version of
*** GLIB is always available from ftp://ftp.gtk.org/. If GLIB is
*** but not in the same location as pkg-config add the location of the
*** glib-2.0.pc to the environment variable PKG_CONFIG_PATH.

i installed glib 2.12.0 from a tarball a day ago. how can i remove the
older one and use the latest version .without downloading the rpm of
glib .