…
..
mh-a68bsd
mh-aix
mh-apollo68
mh-cxux7
mh-cygwin32
mh-go32
mh-hpbsd
mh-irix4
mh-ncr3000
mh-riscix
mh-sysv
mh-sysv4
mh-windows
mt-sunos4
mt-vxworks5