I'm not familiar with Redhat Enterprise, but I've had some exposure to Fedora, so feel free to ignore me. I would guess the development files can be installed using the Redhat package management tool. I assume you can use yum with RHEL.
libX11 is only one of many X Windows libraries so there may not be a libX11-devel package all by itself. You may need to look for a package that contains all of the X Windows development stuff. In fact, GTK looks for several X libraries besides libX11. I know some are optional, but I don't know which ones are required.
The X Windows development files may also be on the RH installation disk(s). If I remember correctly the Fedora disks had the development files.
BTW, GTK also depends on Pango, ATK, libTIFF, libjpeg as of version 2.10.4. Pango depends on Cairo and glib2, Cairo depends on pkg-config.
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