Install this version:
emerge -a =app-vim/csound-syntax-20160804-r2
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =app-vim/csound-syntax-20160804-r2
Or alternatively:
emerge --autounmask-write -a =app-vim/csound-syntax-20160804-r2
# Copyright 1999-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
inherit vim-plugin
DESCRIPTION="vim plugin: set of tools for editing Csound files with vim"
HOMEPAGE="https://github.com/luisjure/csound-vim"
LICENSE="MIT"
KEYWORDS="amd64 x86"
VIM_PLUGIN_HELPFILES="${PN}"
PATCHES=( "${FILESDIR}/${PN}-doc.patch" )
RDEPEND="!media-sound/csound[vim-syntax]"
!media-sound/csound[vim-syntax]