Cannot extract address (ADR) from vCards (only LABEL)

I've received the following bug report via the Debian bugtracker (http://bugs.debian.org/695936):
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glabels cannot use the information in the ADR fields but insists on
using LABEL fields, even if they don't exist. Yet, RFC 2426 makes
LABEL an optional field that CAN be used to specify an address
label, but does not replace or provide an alternative to ADR.

Furthermore, vCard 4.0 drops LABEL altogether.

Therefore, please let me use the well-defined information in the ADR
fields for a merge.