alpha
amd64
amd64-fbsd
arm
hppa
ia64
m68k
mips
ppc
ppc64
s390
sh
sparc
sparc-fbsd
x86
x86-fbsd

# Prefix keywords
ppc-aix
x86-freebsd
x64-freebsd
hppa-hpux
ia64-hpux
x86-interix
mips-irix
amd64-linux
arm-linux
ia64-linux
x86-linux
ppc-macos
x86-macos
x64-macos
m68k-mint
x86-netbsd
ppc-openbsd
x86-openbsd
x64-openbsd
sparc-solaris
sparc64-solaris
x64-solaris
x86-solaris
x86-winnt