Sun platform has two distributions. 

SunOS 
   package was compiled on a Sun (Sparc IPC) running 
   SunOS 4.1.1 (X11 R5) using gcc

   bxform-sun3 was compiled on sun3y SunOS 4.1.1. with gcc and OpenWinow.

Solaris package was compiled on a Sun4c running 
     Solaris 2.5(SunOS 5.5) with X11 R5