Welcome to... ... the GNU Hurd!
GNU/Hurd uses the ELFOSABI_GNU value for operating system/ABI identification. This is shared with GNU/Linux.
ELFOSABI_GNU
id:"20110619130724.GV6349@const.famille.thibault.fr"
id:"20110619201952.GS27884@const.famille.thibault.fr"
id:"20110619203224.GT27884@const.famille.thibault.fr"