No, setting install_path did not change the path for etc directory; see the OP, namely PERL_MB_OPT assignment & result of grep ... _build.

I had not tried doing the manual installation for the offending module, for I need to install that thing in an automated way (as it is only one of many dependencies of App::SourcePlot).

In reply to Re^2: Module::Build- Overriding default $Config{installprefix} by Anonymous Monk
in thread Module::Build- Overriding default $Config{installprefix} by Anonymous Monk

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