aix                  for AIX 4.x xlC
aix5                 for AIX 5.x xlC
aixegcs              for AIX 4.x egcs 1.1.x
alphacxx6            for DEC Unix cxx6
alphaegcs            for DEC Unix egcs 1.1.x
alphakcc             for DEC Unix KCC
freebsd              for FreeBSD
freebsd4             for FreeBSD 4.x
hpuxacc              for HP-UX 10.20 aCC
hpuxegcs             for HP-UX 10.20 egcs 1.1.x
hpuxia64acc          for HP-UX 11i v1.5 (IA-64) aCC
hurddeb              for Debian GNU/Hurd with gcc and glibc
linux                for Linux egcs 1.1.x, gcc 2.9x, gcc 3.x and glibc
linuxalphaegcs       for Alpha Linux egcs and glibc
linuxarm             for ARM Linux egcs and glibc
linuxdeb             for Debian GNU/Linux v2.1+ gcc and glibc
linuxdeb2            for Debian GNU/Linux v2.0 egcs and glibc
linuxdeb2ppc         for PPC Linux based on Debian v2.0
linuxia64ecc         for Itanium Linux Intel ecc and glibc
linuxia64gcc         for Itanium Linux gcc 2.9x and glibc
linuxia64sgi         for Itanium Linux sgiCC and glibc
linuxicc             for Linux Intel's icc and glibc
linuxkcc             for Linux KAI's KCC and glibc
linuxpgcc            for Linux pgcc and glibc
linuxppcegcs         for PPC Linux egcs and glibc
linuxrh42            for Linux gcc 2.7.x.x and libc5
linuxrh51            for Linux gcc 2.7.x.x and glibc
linuxsuse6           for Linux (SuSE v6.0) egcs and glibc
linuxx8664gcc        for AMD Opteron (64 bit mode) Linux gcc 3.x and glibc
lynxos               for LynxOS with gcc
macosx               for MacOS X with cc
macosxxlc            for MacOS X with IBM xl compilers
mklinux              for MkLinux gcc and glibc
sgicc                for SGI IRIX 6.x CC
sgicc64              for SGI IRIX 6.x CC 64 bits
sgiegcs              for SGI IRIX 6.x egcs 1.1.x
sgikcc               for SGI IRIX 6.x KCC
sgin32egcs           for SGI IRIX 6.4 egcs 1.1.x using n32 ABI
solaris              for Solaris CC
solarisCC5           for Solaris CC 5.0
solarisgcc           for Solaris gcc
solariskcc           for Solaris KCC
win32                for Win32 with VC++
win32gdk             for Win32 with VC++ and gdk based GUI
win32gcc             for Win32 with cygwin/gcc