What steps will reproduce the problem? ./configure --without-portaudio --without-ffmpeg --prefix=/usr

What do you see instead? checking for main in -lavdevice ... no configure: error: Missing a required library, please install it or disable ffmpeg support by passing --without-ffmpeg to configure

What version of the product are you using? On what operating system? Revision 449, Ubuntu

Yeah I know, need to check the enable value of AC_ARG_WITH, just don't pass --without-ffmpeg and it'll compile without ffmpeg.

Attached is a patch that takes a shot at fixing dependency selection for ffmpeg and all other dependencies. --with and --without should now work as expected, while the default behavior remains the same for each option.

Attached is an updated version of the patch that also fixes checking for libusb, something I missed in the previous patch. It would be nice if this could get merged, especially since it's fully backwards-compatible.