Ok, I fixed it, although the fix is not elegant :-)


In int/lib/openpty.c add the #define shown below:



#include "useproto.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>


#define SUN4OS5platform   <----------------



It seems to me this should be fixable by putting in 
src/sman/Makefile.pamphlet


CFLAGS= ${CCF} -DSUN4OS5platform


but somehow that definition doesn't seem to work.  I can't see it in the output 
of the make.


Anyhow, everything works now!