export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/lib/pkgconfig

Naravno, putanje uskladi prema svom sistemu.

checking for pkg-config... (cached) /usr/bin/pkg-config
checking for GTK+ - version >= 2.2.2...
*** 'pkg-config --modversion gtk+-2.0' returned 2.2.4, but GTK+ (2.2.1)
*** was found! If pkg-config was correct, then it is best
*** to remove the old version of GTK+. 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: Test for GTK+ failed. See the file 'INSTALL' for help.


eto novog problema....
towk??

Instaliraj novi GTK preko starog (u isti prefiks), ili prvo deinstaliraj stari pa instaliraj novi gde hoćeš, mada opet je najlakše da ga rokneš na isto mesto.