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The Open Edition of the F# compiler, core library and tools
F# C# Other

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This is the F# compiler, core library and core tools (open source edition). It uses the Apache 2.0 license.

The master branch is for the latest version of F# (currently F# 3.0).

To bootstrap the compiler, binaries built from an earlier version of this project are used.


Requires mono 2.9 or higher. Prefer Mono 3.0.

On OSX, requires automake 2.69. To install from homebrew:

brew install automake


To build and install on non-MacOS systems:

sudo make install

On MacOS (OSX), use a prefix to your version of Mono:

./ --prefix=/Library/Frameworks/Mono.framework/Versions/Current/
sudo make install

To build the FSharp.Core.dll for Mono for Android, use:

make do-2-1

You can also build using xbuild:

cd src
xbuild fsharp-build.proj

However the binaries produced are NOT yet usable because they are not correcy strong-name signed. Further, building using xbuild does not create a Mono-ready distribution (see src/fsharp/targets.make).

Development notes

We have a CI build set up with the JetBrains/Teamcity server as part of the F# community projects there:

@forki controls access. Right now this builds both a Mono 'make' install and a Windows 'cd src; msbuild fsharp-build.proj' build. No binaries are saved from the build, it is just for sanity checking.

Uses bootstrapping libraries, tools and F# compiler. The lib/bootstrap/X.0 directories contain mono-built libraries, compiler and tools that can be used to bootstrap a build. You can also supply your own via the --with-bootstrap option.

F# compiler sources dropped by Microsoft are available from

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