Consider Module::Build as undeclared prerequisite only if there are no configure phase prereqs declared #136
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This brings it in line with cpanm's heuristic: https://metacpan.org/source/MIYAGAWA/Menlo-Legacy-1.9022/lib/Menlo/CLI/Compat.pm#L1971
The presence of a Build.PL by itself does not indicate that Module::Build is required (in particular, there are now many Module::Build::Tiny based Build.PLs), and a configure prereq will be added for any other Build.PL based installer.