These ebuilds come from http://proaudio.tuxfamily.org/wiki.
If you have some problems, go to the official site first.
ntk : A fork of the Fast Light ToolKit library, adding improved graphics rendering via Cairo ( http://non.tuxfamily.org/wiki/NTK )
qwt : 2D plotting library for Qt4 ( http://qwt.sourceforge.net/" HOMEPAGE="http://qwt.sourceforge.net/ )
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