How else do you deal with all the import invocations in the source code files with outdated versions? M4? Make + C preprocessor? Perl generating Perl? I tried

How else do you deal with all the import invocations in the source code files with outdated versions? M4? Make + C preprocessor? Perl generating Perl? I tried to guess the least-absurd option for updating a library. Please inform the rest of us what the standard tooling for handling this in the Perl community is.