AC_CHECK_DECLS([perror, vasprintf, vsnprintf])
-# See if <sys/user.h> supports the %fs_base and %gs_bas amd64 segment registers.
-# Older amd64 Linux's don't have the fs_base and gs_base members of
-# `struct user_regs_struct'.
-AC_CHECK_MEMBERS([struct user_regs_struct.fs_base, struct user_regs_struct.gs_base],
- [], [], [#include <sys/types.h>
-#include <sys/user.h>])
-
-
AC_CHECK_TYPES(socklen_t, [], [],
[#include <sys/types.h>
#include <sys/socket.h>