xgrass make on a DEC 5000

GrassHoppers:

     While trying to gmake4.1beta xgrass on my DEC 5000/200, I keep getting
messages like this:

# /usr/local2/bin/gmake4.1beta
  SRC = /usr/user3/grass/src
  CMD = /usr/user3/grass/src/CMD
  HEADER = DEC
  ARCH =
  GISBASE = /usr/user3/grass
  VERSION = 4.1beta Spring 1993
#################################################################
/usr/user3/grass/src/xgrass/menu
  make -f OBJ/make.rules

rm -f OBJ/main.o
cc -O -D_NO_PROTO -I../include -I/usr/include/X11
-I/usr/user3/grass/src/inclu
de -c main.c
ccom: Error: /usr/include/X11/Xm/Xm.h, line 2111: syntax error
      typedef XtPointer (*XmResourceBaseProc)();
      -------------------^
ccom: Error: /usr/include/X11/Xm/Xm.h, line 2111: function returns illegal
type
      typedef XtPointer (*XmResourceBaseProc)();
      -----------------------------------------^
ccom: Error: /usr/include/X11/Xm/Xm.h, line 2126: syntax error
          XmResourceBaseProc base_proc;
      ---------------------^
(ccom): /usr/include/X11/Xm/Xm.h, line 2126: cannot recover from earlier
errors:
goodbye!
          XmResourceBaseProc base_proc;
      ----------------------------------^
*** Error code 1

Stop.
# fire/usr/user3/grass/src/xgrass/menu[621]

    Does anybody know what I'm doing wrong? Has anyone made xgrass on a
DEC 5000?

                             Thanks,
--------------------------------------------------------------
   ____ Oak Ridge National Laboratory
    / ) / / / / Environmental Sciences Division
   /--< o / / /--/ P.O. Box 2008, M.S. 6038
  /___/__<__/__/_ / / _ Oak Ridge, TN 37830-6038
William W. Hargrove (615) 574-1902
hnw@mtqgrass.esd.ornl.gov (615) 576-8646 (fax)
--------------------------------------------------------------