AC_DEFUN(AM_SANITY_CHECK,
[AC_MSG_CHECKING([whether build environment is sane])
sleep 1
echo timestamp > conftestfile
if (
set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null`
if test "[$]*" = "X"; then
set X `ls -t $srcdir/configure conftestfile`
fi
if test "[$]*" != "X $srcdir/configure conftestfile" \
&& test "[$]*" != "X conftestfile $srcdir/configure"; then
AC_MSG_ERROR([ls -t appears to fail. Make sure there is not a broken
alias in your environment])
fi
test "[$]2" = conftestfile
)
then
:
else
AC_MSG_ERROR([newly created file is older than distributed files!
Check your system clock])
fi
rm -f conftest*
AC_MSG_RESULT(yes)])