Ported systems:

SunOS 4.1.3, Sun 4, gcc 2.3.3, all flags, current revision of code.
SunOS 4.1.1_U1 Sun3, gcc 2.3.3, version 2.40
SunOS 4.1, gcc 1.39, Version 2.1 and earlier
Ultirx 4.3, gcc 2.3.3, with -DNEW, -DV3, -DCARRYOVER, -DULTRIX
  (appears to require a strdup function, use -DULTRIX to get)
  Version 2.29. Version 2.40 appears to work (but final make fails)
  Manual compilation of Blind from the *.o files seems to be needed.
  [2.40 alpha1 was tested, not released version of code)


Tried systems (I.e. I did a make and saw what happened):
SunOS 4.0.1 Sun 386i: failed due to header files missing. Probably would work
   otherwise.
HPUX 8.07: failed due to type problems in global.h. -DULTRIX Fixed those, now
   dies on O_RDWR, O_CREAT which it should get from fcntl.h.
HPUX 9.01: see HPUX 8.07
