Nim is a compiled, garbage-collected systems programming language with a design that focuses on efficiency, expressiveness, and elegance (in the order of priority).
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Latest commit 0e276be Aug 17, 2017 @enthus1ast enthus1ast committed with Araq fixes #6250 (#6251)
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bin empty.txt files: Trim trailing whitespace Sep 4, 2015
build empty.txt files: Trim trailing whitespace Sep 4, 2015
ci Removed fasm support. Feb 20, 2017
compiler Fixes #5965 (#6237) Aug 14, 2017
config Added missing C++ options for VCC (#6195) Aug 8, 2017
doc show splitWhitespace instead of split in tut2 Aug 13, 2017
examples Remove expr/stmt (#5857) Jul 25, 2017
icons Added icons support for Visual Studio compiler Sep 30, 2016
lib fixes #6250 (#6251) Aug 17, 2017
nimsuggest attempt to make nimsuggest work with choosenim May 11, 2017
tests Fixes #5965 (#6237) Aug 14, 2017
tinyc Trim remaining .txt files trailing whitespace Sep 4, 2015
tools Introduce first class support for Android (#5772) Aug 6, 2017
web make nimblepkglist tool work with newer versions of the website Jul 20, 2017
.gitignore Added Windows and VCC build artifacts to gitignore Aug 8, 2017
.gitlab-ci.yml CI: Store build/*.zip artifacts. Oct 10, 2016
.travis.yml travis build: test documentation generation Jul 26, 2017
appveyor.yml disable 'koch boot' on AppVeyor to speedup the process; will be re-en… Aug 4, 2017
compiler.nimble attempt to make the build green again Jan 7, 2017
copying.txt website: http to https updates Feb 6, 2017
install.txt document the new way of doing things; refs #4934 Oct 24, 2016
install_nimble.nims Fixes install_*.nims scripts on Linux. Jan 28, 2017
install_tools.nims Fixes install_*.nims scripts on Linux. Jan 28, 2017
koch.nim added koch xtemp command for easier compiler development Jun 8, 2017
koch.nim.cfg Rename *.nimrod.cfg to *.nim.cfg Feb 3, 2015 Small fix to README Aug 6, 2017
readme.txt fixes some typos Jan 19, 2016
todo.txt minor todo.txt update Apr 2, 2017

Nim Build Status

This repository contains the Nim compiler, Nim's stdlib, tools and documentation. For more information about Nim, including downloads and documentation for the latest release, check out Nim's website.


Join the IRC chat Join the Gitter chat Get help View Nim posts on Stack Overflow Follow @nim_lang on Twitter

  • The forum - the best place to ask questions and to discuss Nim.
  • #nim IRC Channel (Freenode) - a place to discuss Nim in real-time. Also where most development decisions get made.
  • Gitter - an additional place to discuss Nim in real-time. There is a bridge between Gitter and the IRC channel.
  • Stack Overflow - a popular Q/A site for programming related topics that includes posts about Nim.


The compiler currently officially supports the following platform and architecture combinations:

  • Windows (Windows XP or greater) - x86 and x86_64
  • Linux (most, if not all, distributions) - x86, x86_64, ppc64 and armv6l
  • Mac OS X (10.04 or greater) - x86, x86_64 and ppc64

More platforms are supported, however they are not tested regularly and they may not be as stable as the above-listed platforms.

Compiling the Nim compiler is quite straightforward if you follow these steps:

First, the C source of an older version of the Nim compiler is needed to bootstrap the latest version because the Nim compiler itself is written in the Nim programming language. Those C sources are available within the nim-lang/csources repository.

Next, to build from source you will need:

  • A C compiler such as gcc 3.x/later or an alternative such as clang, Visual C++ or Intel C++. It is recommended to use gcc 3.x or later.
  • Either git or wget to download the needed source repositories.
  • The build-essential package when using gcc on Ubuntu (and likely other distros as well).

Then, if you are on a *nix system or Windows, the following steps should compile Nim from source using gcc, git and the koch build tool (in the place of sh you should substitute build.bat on x86 Windows or build64.bat on x86_64 Windows):

$ git clone
$ cd Nim
$ git clone --depth 1
$ cd csources
$ sh
$ cd ../
$ bin/nim c koch
$ ./koch boot -d:release

Finally, once you have finished the build steps (on Windows, Mac or Linux) you should add the bin directory to your PATH.


koch is the build tool used to build various parts of Nim and to generate documentation and the website, among other things. The koch tool can also be used to run the Nim test suite.

Assuming that you added Nim's bin directory to your PATH, you may execute the tests using ./koch tests. The tests take a while to run, but you can run a subset of tests by specifying a category (for example ./koch tests cat async).

For more information on the koch build tool please see the documentation within the doc/koch.rst file.


nimble is Nim's package manager and it can be acquired from the nim-lang/nimble repository. Assuming that you added Nim's bin directory to your PATH, you may install Nimble from source by running koch nimble within the root of the cloned repository.


This project exists thanks to all the people who contribute. Read on to find out how to contribute.


Backers on Open Collective Sponsors on Open Collective Contribute to Nim via Gratipay Setup a bounty via Bountysource Donate Bitcoins

We welcome everyone's contributions to Nim independent of how small or how large they are. Anything from small spelling fixes to large modules intended to be included in the standard library are welcome and appreciated. Before you get started contributing, you should familiarize yourself with the repository structure:

  • bin/, build/ - these directories are empty, but are used when Nim is built.
  • compiler/ - the compiler source code. Also includes nimfix, and plugins within compiler/nimfix and compiler/plugins respectively.
  • nimsuggest - the nimsuggest tool that previously lived in the nim-lang/nimsuggest repository.
  • config/ - the configuration for the compiler and documentation generator.
  • doc/ - the documentation files in reStructuredText format.
  • lib/ - the standard library, including:
    • pure/ - modules in the standard library written in pure Nim.
    • impure/ - modules in the standard library written in pure Nim with dependencies written in other languages.
    • wrappers/ - modules which wrap dependencies written in other languages.
  • tests/ - contains categorized tests for the compiler and standard library.
  • tools/ - the tools including niminst and nimweb (mostly invoked via koch).
  • web/ - the Nim website.
  • koch.nim - tool used to bootstrap Nim, generate C sources, build the website, and generate the documentation.

If you are not familiar with making a pull request using GitHub and/or git, please read this guide.

Ideally you should make sure that all tests pass before submitting a pull request. However, if you are short on time, you can just run the tests specific to your changes by only running the corresponding categories of tests. Travis CI verifies that all tests pass before allowing the pull request to be accepted, so only running specific tests should be harmless.

If you're looking for ways to contribute, please look at our issue tracker. There are always plenty of issues labelled Easy; these should be a good starting point for an initial contribution to Nim.

You can also help with the development of Nim by making donations. Donations can be made using:

If you have any questions feel free to submit a question on the Nim forum, or via IRC on the #nim channel.


Thank you to all our backers! [Become a backer]


Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]

You can also see a list of all our sponsors/backers from various payment services on the sponsors page of our website.


The compiler and the standard library are licensed under the MIT license, except for some modules which explicitly state otherwise. As a result you may use any compatible license (essentially any license) for your own programs developed with Nim. You are explicitly permitted to develop commercial applications using Nim.

Please read the copying.txt file for more details.

Copyright © 2006-2017 Andreas Rumpf, all rights reserved.