http://gcc.gnu.org/gcc-4.3/changes.html " All GCC ports for the following operating systems have been declared obsolete: BeOS (*-*-beos*) kaOS (*-*-kaos*) GNU/Linux using the a.out object format (*-*-linux*aout*) GNU/Linux using version 1 of the GNU C Library (*-*-linux*libc1*) Solaris versions before Solaris 7 (*-*-solaris2.[0-6], *-*-solaris2.[0- 6].*) Miscellaneous System V (*-*-sysv*) WindISS (*-*-windiss*) " /Jonas.