Problem of installation of gtk+2.2.1

[MALHERBE <malherbe hugues wanadoo fr>]

Hello,

I have problems for installing gtk+2.2.1.

I have installed before glib-2.2.1.
When I try to install atk-1.2.0, I have the following error retrun form 
./configure execution :

*** 'pkg-config --modversion glib-2.0' returned 2.2.1, but GLIB (2.0.6)
*** 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

I don't know what to do ?
do I have to remove the old version of glib ?
If yes, I don't know how to do it ?

Thanks in advance for your answers.