Check whether a given LV2 plugin is up to the specification

An LV2 lint-like tool that checks whether a given plugin and its UI(s) match up with the provided metadata and adhere to well-known best practices.

Run it as part of your continuous integration pipeline together with lv2/sord_validate to reduce the likelihood of shipping plugins with major flaws in order to prevent unsatisfied users.

Note: This is an early release, if you happen to find false-positive warnings when using this tool, please report back, so it can be fixed.

Build status

build status


Stable release

Unstable (nightly) release


Stable release

Git repository


Bugs and feature requests



  • LV2 (LV2 Plugin Standard)
  • lilv (LV2 plugin host library)


  • libcurl (The multiprotocol file transfer library)
  • libelf (ELF object file access library)

lv2lint can optionally test your plugin URIs for existence. If you want that, you need to enable it at compile time (-Donline-tests=true) and link to libcurl. You will also need to enable it at run-time (-o), e.g. double-opt-in.

lv2lint can optionally test your plugin symbol visibility and link dependencies. If you want that, you need to enable it at compile time (-Delf-tests=true) and link to libelf.

Build / install

git clone https://git.open-music-kontrollers.ch/lv2/lv2lint
cd lv2lint
meson -Donline-tests=true -Delf-tests=true build
cd build
sudo ninja install

Compile options

  • online-tests (check URIs via libcurl, default=off)
  • elf-tests (check shared object link symbols and dependencies, default=off)


Information about the command line arguments are described in the man page:

man 1 lv2lint

An acceptable plugin SHOULD pass without triggering any fails, this is also the default configuration:

lv2lint -I ${MY_BUNDLE_DIR} http://lv2plug.in/plugins/eg-scope#Stereo

A good plugin SHOULD pass without triggering any warnings:

lv2lint -I ${MY_BUNDLE_DIR} -E warn http://lv2plug.in/plugins/eg-scope#Stereo

A perfect plugin SHOULD pass without triggering any warnings or notes:

lv2lint -I ${MY_BUNDLE_DIR} -E warn -E note http://lv2plug.in/plugins/eg-scope#Stereo

If you get any warnings or notes, you can enable debugging output to help you

lv2lint -d -I ${MY_BUNDLE_DIR} -E warn -E note http://lv2plug.in/plugins/eg-scope#Stereo

fix the problems:

By default, lv2lint runs in packager mode and skips some tests. The latter are important only for plugins that are distributed in binary form by the developer directly. To activate those tests, run in (nopack)ager mode:

lv2lint -I ${MY_BUNDLE_DIR} -M nopack http://lv2plug.in/plugins/eg-scope#Stereo


Copyright (c) 2016-2020 Hanspeter Portner (dev@open-music-kontrollers.ch)

This is free software: you can redistribute it and/or modify it under the terms of the Artistic License 2.0 as published by The Perl Foundation.

This source is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Artistic License 2.0 for more details.

You should have received a copy of the Artistic License 2.0 along the source as a COPYING file. If not, obtain it from http://www.perlfoundation.org/artistic_license_2_0.