XDRIVER problems on HP 9000/710

[ANANTHA PRASAD]

Dear GrassUsers: I am trying to compile grass4.1 (Spring
1993) on a HP 9000/710 workstation running HP-UX 9.01
and HP-VUE 3.0...I run into the following problem when
trying to compile XDRIVER...anybody out there with
experience compiling on HP..who can help me out?

Thanks kindly... Prasad
NOTE: I am not on the grass users mailing list..so,
please reply directly to aprasad at asrr.arsusda.gov ...
I will post a summary to the list. Thanks.
/npi/grass4.1/source/src/display/devices/XDRIVER/XDRIVER
 mkdir OBJ.hp
 make -f OBJ.hp/make.rules

 rm -f version.h
 echo '#define WIN_NAME "GRASS 4.1"' > version.hrm -f OBJ.hp/SWITCHER.o
 cc -D_NO_PROTO -I/npi/grass4.1/source/src/include -DUSE_TERMIO -c
 SWITCHER.c
 ./includes.h: 9: Can't find include file X11/Xos.h
 ./includes.h: 11: Can't find include file X11/Xlib.h
 ./includes.h: 12: Can't find include file X11/Xutil.h
 *** Error code 1 Stop.
 *** Error code 1

 Stop.
 GISGEN failure at STEP: src/display/devices/XDRIVER