"mingw" is for installing linux in Windows AFAIK.
'pkgconfig' is in /usr/local/i386-mingw32/lib/pkgconfig
and thus rather invisible !
(The files will probably not work in RHEL 5 linux)
" GLIB version 2.16.3 using (./configure;make;make install) "
The files are in /usr/local/, 'pkgconfig' in /usr/local/lib/pkgconfig
Still having glib-2.0-2.12.3 installed in /usr/ , this one is first in
your path and will display by "pkg-config --modversion glib-2.0"
2.16.3 might break some of your applications, depending on 2.12.3
if 2.16.3 was the only glib2 to be used.
Uninstalling 2.12.3 will remove 600? other packages, the most of your system.