How to install Monkeysphere on OSX El Capitan
I got it working like this

#configure perl
sudo perl -MCPAN -e shell
perl&gt; o conf init
#update perl (this takes a while)
sudo perl -MCPAN -e 'install Bundle::CPAN'
#link openssl
brew link openssl --force
#installing this dependency that monkeysphere was originally complaining about
cpan -i Crypt::OpenSSL::Bignum
#installing monkeysphere
brew install monkeysphere