allow disable and enable postproc library (libpostproc). Reproducible: Always Steps to Reproduce: 1. emerge -av =vlc-9999 without libpostproc installed 2. 3. Actual Results: you'll get error Expected Results: ebuild let you choose if you want use libpostproc or not and by use flag it enable or disable at build time
i guess you might want to check vlc's useflags....