I'm getting ready to reorganize my home system, where I run NetBSD and
FreeBSD at different times (my 8-year-old likes FreeBSD :-) 

The netscape executable comes in a file format that allows it to run in
either system.  How can I build programs (e.g., "xboing")  this way? 

/jim> file netscape
netscape: 386BSD demand paged executable
/jim> cd /usr/X11R6/bin ; file xboing
xboing: NetBSD/i386 demand paged dynamically linked executable
/jim> cd /emul/freebsd/usr/X11R6/bin ; file xboing
xboing: FreeBSD/i386 demand paged dynamically linked executable


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<http://www.cs.indiana.edu/picons/db/users/us/md/lib/bcpl/jspath/face.xbm>
Marvin the Paranoid Android says:
Why stop now just when I'm hating it?