pygobject-2.20.0 configure script not seeing glib-2.22.0 in prefix /usr/local/

["Jon ." <jonforthewin gmail com>]

I've installed glib-2.22.0 on CentOS 5.4 x86_64 with the typical
./configure ; make ; make install process with --prefix=/usr/local ,
everything appeared to go fine. When running the configure script in
the pygobject-2.20.0 tarball, it stops on an error looking for glib.

checking for GLIB - version >= 2.14.0... no
*** Could not run GLIB test program, checking why...
*** The test program failed to compile or link. See the file config.log for the
*** exact error that occured. This usually means GLIB is incorrectly installed.
configure: error: maybe you want the pygobject-2-4 branch?
[root localhost pygobject-2.20.0]#

How should pygobject be pointed to glib in /usr/local/, or how should
glib be installed?