Regards installing Oracle/Berkeley BD, I did this only yesterday on Solaris. I unpacked the tar file and did the following:

cd build_unix 
sh -c "CC=gcc ../dist/configure --prefix=/you/install/path/here" 
make 
make install
[download]

Oracle have documentation for building on Win32 and OS X platforms also. dragonchild has advised you of an alternative if you do not have your heart set on Berkeley DB.

Hope this helps.

Martin