Multiple versions of perl should coexist with no problems (though /usr/bin/perl can only be one of them :).

So is it saying "Can't locate HTTP/Status.pm in @INC" or "Can't locate LWP/UserAgent.pm" in @INC" ? (HTTP::Status is also part of LWP, and should be there.) If the file it is complaining about is really there, try

print(do "full-pathname-to-.pm-file" ? "ok" : "error: $!");
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