4 (3.2.5 [IBM XL C Compiler])
8 (3.x [Apple C Compiler, GNU C])
11 <a href="http://www.freebsd.org/">FreeBSD</a>
15 <a href="http://www.hp.com/">HP-UX</a>
19 <a href="http://www.hp.com/">HP-UX</a>
20 (9.10/m68k [HP-UX cc]; 11.11/hppa [GNU C 4.2.3])
24 (6.5 [SGI MIPSpro C 7.30])
27 <a href="http://www.linux.org/">Linux</a>
28 (2.2.x/i386, 2.4.x/i386+hppa, 2.6.x/i386+hppa [GNU C])
31 <a href="http://www.apple.com/macosx/">Mac OS X</a>
32 (10.x [GNU C 2.95.x, 3.x, 4.0.1])
35 <a href="http://www.netbsd.org/">NetBSD</a>
36 (1.5.2/i386, 1.5.3/m68k [GNU C])
39 <a href="http://www.obenbsd.org/">OpenBSD</a>
43 <a href="http://www.sun.com/">Solaris</a>
47 Windows mit <a href="http://sources.redhat.com/cygwin/">Cygwin</a>