Where is the PKG-config files for gtk on Red Hat 4?

["ying lcs" <yinglcs gmail com>]

Hi, I have set my PKG_CONFIG_PATH as follow:

# echo $PKG_CONFIG_PATH
/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig/:/usr/share/pkgconfig

But when I try to run 'configure' for a program, it can't find gtk+-2.0.pc.
Can you please tell me what should I set the PKG_CONFIG_PATH to be for
this to compile?

checking for pkg-config... /usr/bin/pkg-config
checking for gtk+-2.0 >= 1.3.7... Package gtk+-2.0 was not found in
the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-2.0' found

configure: error: Library requirements (gtk+-2.0 >= 1.3.7) not met;
consider adjusting the PKG_CONFIG_PATH environment variable if your
libraries are in a nonstandard prefix so pkg-config can find them.