Correctly determining Build-Depends

[Maykel Moya <moya@cubaweb.com>]

I'd followed the step recommended in maint-guide to obtain Build-Depends

$ objdump -p /usr/bin/foo | grep NEEDED

then a dpkg -S on each founded library. But I have now a (not so little)
list of packages. I can add all of their -dev versions to Build-Depends
but there are already dependencies among then.

Do exists a tool to automatize this task, I mean, obtain the minor
subset of packages that resolved (which their respective dependencies)
to a given a list of packages.

Regards
mike