LinuxQuestions.org - updating glib

Story so far,
I had unziped (prob I should say untared) the downloaded files in
/usr/src/glib-2.2.3/
I had then installed glib from there.

./configure
make
make check (all 29 test pass here)
make install
--------------------------------
Libraries have been installed in:
/usr/local/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
- add LIBDIR to the `LD_LIBRARY_PATH' environment variable
during execution
- add LIBDIR to the `LD_RUN_PATH' environment variable
during linking
- use the `-Wl,--rpath -Wl,LIBDIR' linker flag
- have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------

/usr/local/lib previously added in ld.so.conf
did "ldconfig" again
"./configure" for atk
---------------------
*** 'pkg-config --modversion glib-2.0' returned 2.2.3, but GLIB (2.2.1)
*** 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
error
*** by modifying your LD_LIBRARY_PATH enviroment variable, or by editing
*** /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
PKG_CONFIG_PATH
*** to point to the correct configuration files
no configure: error:
*** GLIB 2.0.0 or better is required. The latest version of
*** GLIB is always available from ftp://ftp.gtk.org/.
--------------------------

In our case the pkg-config is correct. How do I remove the old glib and
get the new one linked to all the programs ?

Please help. Thanks in advance.