glibc/sysdeps/unix/sysv/linux/mips/configure.in

sinclude(./aclocal.m4)dnl Autoconf lossage
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux/mips.

case $machine in
mips*64*)
  rm -f asm-unistd.h
  asm_unistd_h=$sysheaders/asm/unistd.h
  if test ! -f $asm_unistd_h; then
    # Try to find asm/unistd.h in compiler header search path.
    try_asm_unistd_h=`echo '#include <asm/unistd.h>' | $CPP - |
			sed -n '/^# 1 "\(\/[^"]*\)".*/{s,,\1,p;q;}'`
    if test -n "$try_asm_unistd_h" &&
       test -f "$try_asm_unistd_h"; then
      asm_unistd_h=$try_asm_unistd_h
    fi
  fi
  if test ! -f "$asm_unistd_h"; then
    AC_MSG_WARN([*** asm/unistd.h not found, it will not be pre-processed])
    echo '#include <asm/unistd.h>' > asm-unistd.h
  else
    # The point of this preprocessing is to turn __NR_<syscall> into
    # __NR_N64_<syscall>, as well as to define __NR_<syscall> to
    # __NR_<abi>_<syscall>, if __NR_<abi>_<syscall> is defined
    # and <abi> is the compiler-enabled ABI.
    cat "$asm_unistd_h" |
    sed -e 's,__NR_,__NR_N64_,g' \
        -e 's,__NR_N64_##,__NR_##,g' \
	-e 's,__NR_N64_O32_,__NR_O32_,g' \
	-e 's,__NR_N64_N32_,__NR_N32_,g' \
	-e 's,__NR_N64_N64_,__NR_N64_,g' \
    | awk > asm-unistd.h '
BEGIN { print "#include <sgidefs.h>"; }
/^#define __NR.*unused/ { print; next; }
/^#define __NR_N64__exit __NR_N64_exit/ {
	print "#define __NR__exit __NR_exit";
	print "#define __NR_O32__exit __NR_O32_exit";
	print "#define __NR_N32__exit __NR_N32_exit";
	print; next;
}
/^#define __NR_O32_/ {
	name = $2;
	sub (/_O32_/, "_", name);
	print;
	print "#if _MIPS_SIM == _ABIO32";
	print "# define " name " " $2;
	print "#endif";
	next;
}
/^#define __NR_N32_/ {
	name = $2;
	sub (/_N32_/, "_", name);
	print;
	print "#if _MIPS_SIM == _ABIN32";
	print "# define " name " " $2;
	print "#endif";
	next;
}
/^#define __NR_N64_/ {
	name = $2;
	sub (/_N64_/, "_", name);
	print;
	print "#if _MIPS_SIM == _ABI64";
	print "# define " name " " $2;
	print "#endif";
	next;
}
{
	print;
}'
  fi ;;
mips*)
  rm -f asm-unistd.h
  echo '#include <asm/unistd.h>' > asm-unistd.h
  ;;
esac