how to change PKG_CONFIG_PATH per gnome-phyton
 

i want to install gdesktop. And I need to compile first pygtk-2.4.0.tar.gz
and gnome-python
I installed pygtk-2.4.0.tar.gz
and now I can't compile gnome-phyton. I had this error but I don't know I to do. This is the error:

checking for python platform... linux2
checking for python script directory... ${prefix}/lib/python2.3/site-packages
checking for python extension module directory... ${exec_prefix}/lib/python2.3/site-packages
checking for headers required to compile python extensions... found
checking for pkg-config... /usr/bin/pkg-config
checking for pygtk-2.0 >= 2.4.0... Package pygtk-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `pygtk-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'pygtk-2.0' found

configure: error: Library requirements (pygtk-2.0 >= 2.4.0) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.
root@ali79:/home/ali79/gdesktop/gnome-python-2.6.0#


thanks