Problems compiling tiff tools on SGI IRIS

I'm having difficulty compiling the GRASS 4.1 raster tiff utilities. I am
using an SGI IRIS with IRIX 4.0.1. I wanted to be able to import/export
tiff files - r.riff.in and r.tiff.out. When I try gmake4.1 in
/usr/local/elle/grass4.1/src.contrib/SCS/raster/r.tiff
I receive the following output:

  SRC = /usr/local/elle/grass4.1/src
  CMD = /usr/local/elle/grass4.1/src/CMD
  HEADER = sgi
  ARCH = sgi
  GISBASE = /usr/local/elle/grass4.1/sgi
  VERSION = 4.1 Spring 1993 Update package 3
#################################################################
/usr/local/elle/grass4.1/src.contrib/SCS/raster/r.tiff
  make -f OBJ.sgi/make.rules

  /usr/local/bin/gmake4.1 -all
  SRC = /usr/local/elle/grass4.1/src
  CMD = /usr/local/elle/grass4.1/src/CMD
  HEADER = sgi
  ARCH = sgi
  GISBASE = /usr/local/elle/grass4.1/sgi
  VERSION = 4.1 Spring 1993 Update package 3
#################################################################
/usr/local/elle/grass4.1/src.contrib/SCS/raster/r.tiff/cmd
  make -f OBJ.sgi/make.rules

  rm -f OBJ.sgi/r.out.tiff.o
  cc -cckr -O -I../libtiff -I/usr/local/elle/grass4.1/src/include
-DUSE_TERMIO -c r.out.tiff.c
ccom: Error: r.out.tiff.c, line 31: unknown size
        struct rasterfile h;
      ---------------------^
ccom: Error: r.out.tiff.c, line 98: unknown size
        h.ras_width = cellhd.cols;
      ---^
ccom: Error: r.out.tiff.c, line 98: ras_width undefined
        h.ras_width = cellhd.cols;
      ------------^
ccom: Error: r.out.tiff.c, line 98: member of structure or union required
        h.ras_width = cellhd.cols;
      ------------^

This is only a partial list of errors...it continues on and on...

If anyone else has had/solved this problem I'd appreciate a private
e-mail message pronto! Thanks very much in advance!

P.S. I also tried on a SUN 4.1 and I received similar errors...

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          _/--_/_/_/_/--_/_/_/_/_/--John C Talcott talcott@trg.saic.com---
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