These ebuilds come from http://proaudio.tuxfamily.org/wiki.
If you have some problems, go to the official site first.
hidapi : A multi-platform library for USB and Bluetooth HID-Class devices ( http://www.signal11.us/oss/hidapi/ )
icu : IBM Internationalization Components for Unicode ( http://ibm.com/software/globalization/icu/ )
libinstpatch : sound font editor library ? ( http://swami.sourceforge.net/ )
libwhy : A library for developing GTK+ audio applications using Lua ( http://smbolton.com/linux/ )
pcl : Portable Coroutine Library (low level functionality for coroutines ( http://xmailserver.org/libpcl.html )
rollendurchmesserzeitsammler : The Rollendurchmesserzeitsamler conservative garbage collector for realtime audio ( http://users.notam02.no/~kjetism/rollendurchmesserzeitsammler/ )
serd : lightweight C library for RDF syntax ( http://drobilla.net/software/serd )
sord : lightweight C library for storing RDF data in memory ( http://drobilla.net/software/sord )
xerces-c : A validating XML parser written in a portable subset of C++. ( http://xerces.apache.org/xerces-c/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a pro-audio
For Paludis use this rsync : rsync://gentoo.zugaina.org/pro-audio-portage
If you have a problem : ycarus(-at-)zugaina.org