Irssi and glib configure problem

Hi guys, i'm trying to setup irssi on my webhost but i'm stuck with a glib problem. I have then downloaded glib and successfully installed it on a non standard path. Here is the error message from irssi.
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.7... yes
checking for GLIB - version >= 2.0.0... 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.
*** trying without -lgmodule
checking for pkg-config... (cached) /usr/bin/pkg-config
checking pkg-config is at least version 0.7... yes
checking for GLIB - version >= 2.0.0... 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.
*** If you don't have GLIB, you can get it from ftp://ftp.gtk.org/pub/glib/
*** We recommend you get the latest stable GLIB 2 version.
*** Compile and install it, and make sure pkg-config finds it,
*** by adding the path where the .pc file is located to PKG_CONFIG_PATH
configure: error: GLIB is required to build irssi.
My question now is how make 'pkg-config' see it as I have glib with the correct version in a non standard path. Any advise would be very appreciated.