Como instalar o Monkeysphere no OSX El Capitan

Tentei instalar o Monkeysphere via Homebrew, mas ele reclama de uma dependência não atendida.

monkeysphere: Unsatisfied dependency: Crypt::OpenSSL::Bignum
Homebrew does not provide Perl dependencies; install with:
   cpan -i Crypt::OpenSSL::Bignum
Error: An unsatisfied requirement failed this build.

Por isso, tentei executar o comando acima mencionado e, no final, ele errou.

Writing Makefile for Crypt::OpenSSL::Bignum
Writing MYMETA.yml and MYMETA.json
cp Bignum/CTX.pm blib/lib/Crypt/OpenSSL/Bignum/CTX.pm
cp Bignum.pm blib/lib/Crypt/OpenSSL/Bignum.pm
/usr/bin/perl /System/Library/Perl/5.18/ExtUtils/xsubpp  -typemap     /System/Library/Perl/5.18/ExtUtils/typemap -typemap typemap  Bignum.xs > Bignum.xsc && mv Bignum.xsc Bignum.c
Please specify prototyping behavior for Bignum.xs (see perlxs manual)
cc -c   -arch x86_64 -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -Os   -DVERSION=\"0.06\" -DXS_VERSION=\"0.06\"  "-I/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE"  -DPERL5 -DOPENSSL_NO_KRB5 Bignum.c
Bignum.xs:5:10: fatal error: 'openssl/err.h' file not found
#include <openssl/err.h>
     ^
1 error generated.
make: *** [Bignum.o] Error 1
KMX/Crypt-OpenSSL-Bignum-0.06.tar.gz
/usr/bin/make -- NOT OK
'YAML' not installed, will not store persistent state
Running make test
Can't test without successful make
Running make install
Make had returned bad status, install seems impossible

Eu consegui trabalhar assim

#configure perl
sudo perl -MCPAN -e shell
perl> 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