The GNU Guitar Effects project contains all the audio effects that come packaged with the GNU Guitar project. It contains all of the original effects from the repository the project started from (originally called 'GNUitar').
CMake is the primary build system for the project, so you'll have to make sure it is installed.
sudo apt get update
sudo apt install cmake
Once CMake is installed, go ahead and build it in the terminal like this:
mkdir build && cd build
cmake ..
cmake --build .
Then you can install it like this:
sudo cmake --build . --target install
Please report bugs on GitHub.
You should always keep in mind, that development of free software doesn't work in the same way as commercial development. Every successful free software project has an active user base behind it. This means that your comments, ideas and bug reports are extremely important. If something doesn't work, or some feature is missing, please mail me about it. Thank you in advance! You can send GNUitar related mails to me at [10]fonin at gnuitar dot com.
GNU Guitar Effects is a free software and is distributed under the terms of GNU GPL license. You are free to copy and share the program with other people, you are not limited with the number of computers where you can use it. You can redistribute the program and the works based on it under the terms of GPL license. You have complete sources and detailed compile instructions to build the program yourself, as well as binaries. You have full freedom with using and sharing the program, according to the GNU software concept.