To put S up on an IRIS 4D machine (the 3000 and 2000 machines
will be much harder due to Fortran/C compatibility problems).
Remember that the machine is a Sys V machine.

1) use natst.C for IEEE arithmetic
	rm -f $P/natst.r
	cp natst.C $P

2) install the iris4d device function 
	cp iris.c $QPE

3) Perform the following operations on both $QPE/Makefile and $QPE/S_makefile

   add -lmld -lgl to the end of system library macro SYSLIB
   get rid of leading underscore on ld_init and Sfun in macro UNDEF
   add iris.o to the end of the DEVICE_FILES list (Makefile only)

4) add the lines 

extern iris4d();
{SYMBOL(iris4d),(long)iris4d,NULL},

to $QPE/S_ld_init.c.


Note: you get a couple of warnings from ccom (compiling $S/ssnap.c)
about illegal pointer combinations involving the signal routine:
   istat = signal(2,(void(*)())1);

====

The following steps were necessary before IRIX release 3.1 but should
be unnecessary after that

add "ar ts $lib >/dev/null" to the ATT case in $A/LIBRARY
   (puts symbol tables on archives)

Use the "-G 8" flag on f77, cc, ld
