lib.pm is perl module stuff. .dylib is .dll .exe .so gcc c compiler stuff. Tips on that can be found in

Re^2: possible to bake LD_LIBRARY_PATH in perl(1)?

Re: Installing external libraries for perlbrew perl

Re^3: DBD::mysql fail install check

Re: Difficult compiling newer Perl on Solaris and DBD::Oracle with odd behavior

http://thecourtsofchaos.com/2013/09/16/how-to-copy-and-relink-binaries-on-osx/