And remember that when installing modules this way, that you can make them install wherever you want using the LIB= and/or PREFIX= arguments to MakeMaker (see the ExtUtils::MakeMaker manpage):

perl Makefile.PL LIB=~/lib

This will install the module's architecture-independent files into ~/l
+ib, the architecture-dependent files into ~/lib/$archname.
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So in the (apparently) common case of installing modules in your own directory on someone else's web server, this is what you can do.