Language package manager for Scheme. (Bug reports to:
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"The purpose of the machine is to make drudgery unnecessary."

— Alan Watts

Akku.scm is a language package manager for Scheme. It grabs hold of code and vigorously shakes it until it behaves properly.

  • Separately declare your dependencies and locked versions.
  • One command to install everything needed for a project.
  • Project-based, installs your locked dependencies to a single library directory.
  • Scan repositories for R6RS/R7RS libraries, even multiple per file, and copy them to the right file paths for any supported Scheme.
  • Resolve all Scheme files needed for compilation and scan them for license notices.

Web site:


Akku.scm requires git and libcurl. It has been tested on GNU/Linux and macOS. (Windows users can run Akku through WSL for now). Assistance in porting is very welcome.


There are two options:

  • Download, unpack and run the binary installer from GitHub. Pre-built versions are available for GNU/Linux amd64. The installation is completely contained to ~/.akku.

  • Download the source bundle from GitHub (files ending with +src.tar.xz). This version is a little slower and takes longer to install, but runs on more types of systems. It requires Chez Scheme 9.5+ or GNU Guile 2.2+.

Please remember to verify the OpenPGP signatures. The releases are signed with E33E61A2E9B8C3A2.


How to get started with a new project:

  • Run akku init project-name. This creates a new project from a template. You can also safely run akku in your existing project directory.
  • Run akku list to list available packages (akku update downloads the package index).
  • Run akku install <pkg> to install a named package. This also installs the code in your current directory into .akku.
  • Run source .akku/bin/activate (in bash) to prepare the environment for the programs and libraries in .akku.

The installed libraries and programs should now be available to you, assuming you use one of these Schemes: Chez Scheme, GNU Guile (with R6RS settings), Ikarus, Larceny, Mosh, Racket (plt-r6rs), Sagittarius, Vicare or Ypsilon.

More details are in the manpage: man docs/akku.1.


Akku.scm is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.