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AIX
(3.2.5 [IBM XL C Compiler])
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A/UX
(3.x [Apple C Compiler, GNU C])
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FreeBSD
(4.5 and newer on i386, x86_64 [GNU C])
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HP-UX
(9.10, 10.20, 11.11 on hppa, m68k [HP-UX cc, GNU C])
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IRIX
(6.5 [SGI MIPSpro C 7.30])
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Linux
(2.x.y, 3.x on hppa, i386, mipsel, powerpc, x86_64, ... [GNU C])
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Mac OS X (Darwin)
(10.0 and newer on i386, powerpc, x86_64 [GNU C 2.95.x, 3.x, 4.x])
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NetBSD
(1.5.2 and newer on alpha, i386, m68k, sparc, x86_64, ... [GNU C])
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OpenBSD
(3.4 and newer on hppa, i386, powerpc, x86_64 [GNU C])
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Solaris
(2.5.1 and newer on i386, sparc [GNU C])
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Windows mit Cygwin
(GNU C)