how was mpg123 package built?

If I download the official mpg123 package and install it, it works fine -- I can listen to audio files. If, otoh, I grab the source package and build it like so,
    apt-get source mpg123
    cd mpg123*
    ./configure
    make
    make install
then the resulting program does *not* work -- I get the usual mpg123 errors about not being able to open the audio device.

I am guessing that the official package was built by supplying a certain set of parameters to ./configure, but I have been unable to find a combination of parameters that works.

Can someone please tell me exactly how the official mpg123 was built from source?

More generally, can someone please tell me in Ubuntu how to find out precisely how a given binary package was built -- that is, what was the source tarball, what diffs were applied, what options were given to ./configure, etc.? There must be a way to find that out, but for the life of me I can't find a way.

Thanks,
Martin Carroll