in reply to
Re^3: Architecture-specific module conflicts under perlbrew
in thread Architecture-specific module conflicts under perlbrew
I believe that JSON::XS was installed under perl 5.14, and found (and choked on) by a separate perl 5.16. If I install with cpanm -f I can clobber one version with another, but that sort of defeats the purpose of perlbrew, which is separate, functioning alternative perl versions with their respective modules.
I posted that as an example of things generally going wrong, rather than as a specific glitch to overcome.