PDP compile under Mandrake 8.0

[Ken Kwok <kenkwok@cmu.edu>]

Has anyone compiled PDP under Mandrake 8.0?  I've hit a hitch with the
compiler complaining:

/usr/local/pdp++/src/ta/typea.cc:57:22: X11/Xlib.h: No such file or
directory
/usr/local/pdp++/src/ta/typea.cc:2792:8: warning: extra tokens at end of
#endif
directive
make[3]: *** [typea.d] Error 1
make[3]: Leaving directory `/usr/local/pdp++/src/ta/LINUX'
make[2]: *** [depend] Error 2
make[2]: Leaving directory `/usr/local/pdp++/src/ta'
make[1]: *** [BasicFiles] Error 2
make[1]: Leaving directory `/usr/local/pdp++/src/ta'
make: *** [Libs] Error 1

I can't seem to  find Xlib.h anywhere in my installation (which was done
from the 2 disk Mandrake 8.0 distribution).  Does anyone know where I
can download the appropriate package and what that rpm might be known
as?  Thanks!

Ken