Open Dylan Downloads

Current Version

The current version is 2020.1, released October 10, 2020:



Size (bytes)

FreeBSD (x86_64)



FreeBSD (x86)



Linux (AArch64)



Linux (x86_64)



Linux (x86)



Mac OS X (Intel)



Windows (32 bit)



(Previous builds can be found on GitHub or in the download directories.)

See the release notes for information about what changed since the previous version.

The source code is available under an open source license in the “dylan-lang” organization on GitHub.

Installation on Unix

Note that Unix versions only have a command-line compiler and no IDE.

Starting with the 2020.1 release all required dependencies (llvm, libgc, libunwind) are included; just unpack the tarball and add the bin directory to your PATH:

$ export PATH=/path/to/opendylan/bin:$PATH

You may wish to sudo apt install lldb-10, for debugging.

For 2019.1 and earlier releases:

  • All Unix platforms must have the Boehm GC and libunwind installed. For example, apt-get install libgc-dev libunwind-dev on Ubuntu.

  • The README file inside the tarball describes installation and basic usage. The easiest way is extracting the tarball in /opt.

  • The Linux and FreeBSD platforms should have gcc installed, in order to allow linking.

  • On Arch Linux you may use the following recipe instead:

    git clone
    cd opendylan
    makepkg -si
  • On macOS you may use this recipe instead:

    brew tap dylan-lang/dylan
    brew install opendylan       # or brew upgrade opendylan

Installation on Windows

For installation, double-click on the installer, and follow instructions. You need to have either the PellesC linker or the linker of VC++ 6.0, 7.0 or the current .NET platform SDK installed. PellesC 8.00 is the best option. (Note that PellesC 9.00 does not work.)

Your environment variables must be set such that the external build system (linker, resource compiler, etc.) can be found. For example, for Pelles C set these environment variables in the System control panel (assuming installation in C:\Program Files\PellesC):

INCLUDE=C:\Program Files\PellesC\include;C:\Program Files\PellesC\include\win
LIB=C:\Program Files\PellesC\lib;C:\Program Files\PellesC\lib\win
PATH=C:\Program Files\PellesC\bin;...more...

You may instead start a Pelles C interactive shell and run C:\Program Files\Open Dylan\bin\win32-environment.exe, but this won’t help if you want to run Open Dylan via the Start menu.

Get Started!

If you’re new to Dylan, you’ll want to check out these handy resources: