Only some very minor comments.

> +[case $ac_file in
> +  *:*)       _AC_CONFIG_SPLIT(ac_file, ac_file, ac_file_in) ;;
> +  - )        ac_file_in=- ;;
> +  * )   ac_file_in=$ac_file.in ;;
> +esac[]dnl

The last case should have a tab after the ")" too, to match the others.
Also, the other code omits space before ")" so this probably should too.

> +     # No need to use "X$at_option", we know how $at_option looks like.

I'd omit this comment; it's obvious.

Other than that it looks good; thanks.  Please install.


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