Compiling on HP750

Sorry if this is a redundant question, I haven't been on the net for
many months. I finally got a hold of a copy of GRASS4.1 (update 3)
and tried compiling on my HP750 workstation. Most of the compilation
ran smoothly but I can't get the XDRIVER to compile. When running
setup I got the complaint that /usr/include/X11 and
/usr/include/X11R4 were invalid directories. Looking at the setup
script I couldn't solve the problem because I couldn't figure out
what "if access r"... meant. The directories do have read permission
to all. If someone with GRASS4.1 running on a HP 700 series could
send me their header file, I'd appreciate it. Otherwise, can someone
suggest what I'm doing wrong?
Thanks, Erin O'Doherty
         Rocky Mountain Experiment Station
         Laramie WY
fswa/s=e.odoherty/ou=r02f06a@mhs.attmail.com