[Module-build-general] 4th (undocumented) argument to ExtUtils::Install::install

[Dave R. <au...@ur...>]

There's a 4th, very important, but completely undocumented argument to
ExtUtils::Install.  This is a flag that tells it to unlink "shadowing"
files, and is how the "perl Makefile.PL UNINST=1" feature is implemented.

Knowing this flag exists makes implementing this feature in Module::Build
very easy.  It also makes me _VERY DAMN IRRITATED_, but I was _already_
irritated about the general state of the legacy Perl build system, so that
changes nothing ;)


-dave

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