Zengargoyles last comment was my first idea, so I would look there first as it absolutely will be the problem if you don't have the libs on the Unix box.
The two libs on win32 are libeay32.dll and ssleay32.dll on Unix I think they are libcrypto.a and libssl.a ( asuming OpenSSL). I would imagine that just looking for the openssl directory would key you into a place to look right away. If they are there... just verify they are in your path.