Newbie looking for help configuring gtk+-2.2.1

[Joerg Balsiger <joergbalsiger yahoo com>]

I'm way over my heading in this, but started out
trying to get my scanner to work on RedHat Linux 7.1

I saw somewhere that I needed glib and gtk+ to get
sane to work. I've downloaded both, was able to
install glib but am stuck with gtk+. When I type
./configure it tellse me towards the end: 

configure: error: Library requirements (glib-2.0 >=
2.1.4 atk >= 1.0.1 pango >= 1.0.1) not met; consider
adjusting the PKG_CONFIG_PATH environment variable if
your libraries are in a nonstandard prefix so
pkg-config can find them.

Can anyone help? Thanks, Joerg

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