Where is appkit/Matrix.h

[Citizen Jimserac]

I don't know much about GNUStep and/or Next but what I've read so far
is pretty impressive.
(I'm a former C/C++ developer, now working in a different field)

I was able to install GNUSTEP on a Windows XP box after failing in
trying to get it to work on Fedora Core 14, wish there was an .rpm.

On XP, I can run GoMoku from a shell OK,   so something must be
working OK but my main purpose was to compile an older program which
needs Matrix.h

The make complains "Fatal Error appkit/Matrix.h" no such file or
directory.

I also downloaded and installed the developer package.

I believe in GNUStep, appkit is now called or a part of gnustep-gui
so I've installed that OK.  Does anyone know where the Matrix.h is or
does one search older distros to find it or what?

Thanks!

J