in reply to Re^4: Protocol scheme 'http' is not supported
in thread Protocol scheme 'http' is not supported
I think all of this comes down to a botched install of LWP::UserAgent, which should include LWP::Protocol::http. Maybe explicitly installing LWP::Protocol or LWP::Protocol::http can get the situation unstuck, but I wonder how the other modules can pass their test suites when the most basic prerequisites are missing.
Maybe you are mixing two versions of Perl, and have half of the module installed on one version and half on the other? Mixing Perl module directories seems like it's always a recipe for bad interactions to me...