Do you have gnome installed? From what I gather, gnome-config comes with the gnome-libs package, so just make sure you have it installed. Now its possible that gnome-config isn't located in the search paths, so try "locate gnome-config" (its better to run "updatedb" before locate, if you haven't run it before. It gets auto run every 4:40AM). Note that what you need is a program called gnome-config, and not gnome-config.h or anything.
BTW, for any application you are compiling, check the documentation for the software it requires, and make sure you have it all installed.
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Hardware - Celeron 266 MHz, 128MB RAM, Intel i740 8MB RAM
Software - Slackware Linux 10.1; Archlinux 0.7; Windows 98 SE
Humanware - GS/CS C++ L+++ w b+++ DI+ D+ e
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