configure script dies on pkg-config, but exists in /usr/lib

Scott Regener <[email protected]>
Newsgroups gmane.comp.gnu.xboard.devel
Message-ID <[email protected]> 
Somewhat inexperienced user here.  Downloaded XCode 3.1.4 to my Powerbook G4 (PowerPC processor) running OS X 10.5.8, installed.  Downloaded xboard-4.7.0 sources and decompressed them.

However, when I run the Xboard ./configure script, it churns along happily for some time and then spits out an Error: Cannot find pkg-config! Please Install it!

Well, I know nothing about fixing this problem.  I go to /usr/lib and there's a directory called pkg-config.  I can find it.  Why can't configure?  Anyone have help for an admitted newbie?
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