Comment 8 for bug 354522

Aleksey,
Mixing applications which use portaudio v18 or v19 on the same system should be no problem, because the shared libraries have different 'sonames': /usr/lib/libportaudio.so.0 (for v18) versus /usr/lib/libportaudio.so.2 (for v19), and the linker will find the right portaudio shared library to go with a particular application.
However, you should take care when rebuilding applications which use portaudio from source, because there can only be one portaudio*-dev package installed at one time.

Jonathan,
Very interesting, I will look into that.