I just started to use perlbrew on an Ubuntu Precise installation and I guess I'm doing something wrong but can't figure it out.

I want to install my perls into a nfs mounted directory /software/lib/perl5/perlbrew
I set PERLBREW_ROOT to that directory and the two perl versions I installed so far have both correctly been installed there.
I also added export PERLBREW_ROOT=/software/lib/perl5/perlbrew to my .bashrc and I can confirm in a terminal that this is indeed set correctly.
In addition, perlbrew info also confirms that PERLBREW_ROOT is set to the above directory.

However, when I install a module like this

 perlbrew exec --with 5.14.2 cpanm Module::Build
[download]

It is successfully installed in my home directory under ${HOME}/lib/perl5 and I can't figure out why. Any clues what I might be doing wrong?
I can also confirm that the cpanm that is used appears to be the one installed with perlbrew (it's in the perlbrew path given above) Thanks for your help!

UPDATE
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Turns out (thanks Corion) that it was an old .modulebuildrc file that had set the install_base to my home dir, so all modules based on Module::Build ended up there.

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