Re: POSIX patches

 On Wed, Apr 23, Olaf Hering wrote:

> -ac_version=`${AUTOCONF:-autoconf} --version 2>/dev/null|head -1| sed -e 's/^[^0-9]*//' -e 's/[a-z]* *$//'`
> +ac_version=`${AUTOCONF:-autoconf} --version 2>/dev/null|head -n 1| sed -e 's/^[^0-9]*//' -e 's/[a-z]* *$//'`

we can make that as complicated as you like:
autoheader --version | sed '1s/^[^0-9]*//;s/[a-z]* *$//;q'

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