<li>A/UX (3.x, original Apple C Compiler oder GNU C)
<li><a href="http://www.freebsd.org/">FreeBSD</a> (4.5/i386, GNU C)
<li><a href="http://www.hp.com/">HP-UX</a> (10.20, GNU C)
+ <li><a href="http://www.hp.com/">HP-UX</a> (9.10/m68k, HP-UX cc)
<li>IRIX (6.5, SGI MIPSpro C 7.30)
<li><a href="http://www.linux.org/">Linux</a> (2.2.x/i386, 2.4.x/i386 und 2.4.x/hppa, GNU C)
<li><a href="http://www.apple.com/macosx/">Mac OS X</a> (10.x, GNU C 2.95.x/3.1)
<li>A/UX (3.x, original Apple C Compiler or GNU C)
<li><a href="http://www.freebsd.org/">FreeBSD</a> (4.5/i386, GNU C)
<li><a href="http://www.hp.com/">HP-UX</a> (10.20, GNU C)
+ <li><a href="http://www.hp.com/">HP-UX</a> (9.10/m68k, HP-UX cc)
<li>IRIX (6.5, SGI MIPSpro C 7.30)
<li><a href="http://www.linux.org/">Linux</a> (2.2.x/i386, 2.4.x/i386 and 2.4.x/hppa, GNU C)
<li><a href="http://www.apple.com/macosx/">Mac OS X</a> (10.x, GNU C 2.95.x/3.1)