Thanks, Bremner!

This series looks reasonable to me.  nice clever hack to reuse the
gmime embedded .c source for the test.

a bit of a tweak below:

On Sat 2022-04-09 09:34:53 -0300, David Bremner wrote:
> +	printf "Checking for GMime new email format... "
> +	if ${CC} -DCHECK_EMAIL ${CFLAGS} ${gmime_cflags} _check_gmime_cert.c ${gmime_ldflags} -o _check_email &&
> +		GNUPGHOME=${TEMP_GPG} ./_check_email; then
> +	    gmime_new_email_format=1
> +	    printf "Yes.\n"
> +	else
> +	    gmime_new_email_format=0
> +	    printf "No (some tests will be skipped).\n"
> +	fi
>      else
>  	printf 'No.\nFailed to set up gpgsm for testing X.509 certificate validity support.\n'
>  	errors=$((errors + 1))

Words like "new" have a tendency to get, well, old.

I'd say

   "Checking GMime emits email addresses from certs without angle brackets..."

And i'd name the variable gmime_cert_addresses_have_angle_brackets (so
"1" effectively means "probably a stale, deprecated version of GMime").

Then change the rest of the tests to match.

This is kind of an aesthetic choice -- i'd be fine with the original
patch too.  but it seems safer to just identify the out-of-date stuff
when it happens, rather than identifying the current stuff.

      --dkg