Ghostscript

I find it a bit wierd that Ghostscript, which I thought was PD, uses this
'Athena' widget set, which isn't PD ??

Is there any way to get hold of a copy of the '*.h', etc. files, so I can
compile Ghostview ??

Cheers,

Steve Culshaw
NRA North West
e-mail : nra@cix.compulink.co.uk (use this for general usage)
or sculshaw@cix.compulink.co.uk (Private - only checked at best
biweekly)