at first was a post at gentoo forum and then i did a post at csound mailing list that caused a fast answer! now i 'm able to run csound on my gentoo system. i guess more people will need these instructions, so: 1. you need to add pro-audio overlay. emerge -v layman layman -kfa pro-audio echo "source /usr/portage/local/layman/make.conf" >> /etc/make.conf 2. emerge -v csound 3. if you have an error complaining about opcodes is just because csound plugins are installed in /usr/lib/csound/ rather th More