Hello. I have written a tool inspired by this bug report. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035888 A full description is available at https://salsa.debian.org/debian/dh-builtusing/-/blob/master/dh_builtusing.pod
This is a proof of concept, any suggestion or critic is welcome (especially before anyone starts depending on it :-). A separate debhelper tool avoids extending the dpkg interface. It should be easier to maintain and document. The price is some redundancy. The tool parses debian/control twice, via Dh_Lib and Dpkg perl modules.
