automake/autoreconf: Incomprehensible error messages bugs

[Bruce Korb]

> $ autoreconf
> autoreconf: configure.ac: AM_GNU_GETTEXT is used, but not 
> AM_GNU_GETTEXT_VERSION
> autoreconf: cannot empty /tmp/ar0.4849: Is a directory
> $ find /tmp/ar0.4849
> /tmp/ar0.4849
> /tmp/ar0.4849/am4tu48Whq
> /tmp/ar0.4849/am4tCpTneD
> /tmp/ar0.4849/am4tiZINdq
> /tmp/ar0.4849/ahAqZXRx
> /tmp/ar0.4849/am4tjiZAF1
> /tmp/ar0.4849/am4t1e7x8O

1.  The automake example of AM_GNU_GETTEXT does not show
     AM_GNU_GETTEXT_VERSION being used in conjunction with it.
    In fact, it isn't even documented at all.

2.  Surely the message, "cannot empty /tmp/ar0.4849: Is a directory"
     can be made more meaningful.  What _does_ it mean?
     (Besides being the error message "rm" will give you.  :)

Thanks - Bruce