How do I heed compile warnings

Hi, Building claws-mail I got lots of messages like this symbol _UI_OpenSSL used from dynamic library /usr/lib/libcrypto.0.9.7.dylib(ui_openssl.o) not from earlier dynamic library /opt/local/lib/libcrypto.0.9.8.dylib(ui_openssl.o) I solved it by moving the libs out of /usr/lib while I built the application. When I ran it it said it couldn't go because those libs weren't present, so I've put them back. It worked, I'm using claws-mail to write this. What is the best way to resolve these issues? How can I do it so that everything is being built inside /opt/local ? malcolm