OS-X and F# [Clone It, Build It, Install It, Hack It]


Mission: Get F# running on OS-X and executing via repl.

There are a number of steps here, that if you don’t have everything covered things just won’t work. So let’s knock out the prerequisites first. This will include getting autoconf installed. There are some other tools that I’ve added below that are good to have installed too, so get autoconf, automake, and libtool installed.

export build=~/devtools # or wherever you'd like to build
mkdir -p $build
cd $build
curl -OL http://ftpmirror.gnu.org/autoconf/autoconf-2.68.tar.gz
tar xzf autoconf-2.68.tar.gz
cd autoconf-2.68
./configure --prefix=/usr/local
sudo make install
export PATH=/usr/local/bin
cd $build
curl -OL http://ftpmirror.gnu.org/automake/automake-1.11.tar.gz
tar xzf automake-1.11.tar.gz
cd automake-1.11
./configure --prefix=/usr/local
sudo make install
cd $build
curl -OL http://ftpmirror.gnu.org/libtool/libtool-2.4.tar.gz
tar xzf libtool-2.4.tar.gz
cd libtool-2.4
./configure --prefix=/usr/local
sudo make install

Now we’re ready to get some F# (64-bit flavors too) running on OS-X. This is very likely to take more than a few minutes because we’ve got two actual builds to do here.

First step is to get mono built and installed.

git clone https://github.com/mono/mono
cd mono
./autogen.sh --prefix=/mono64 --enable-nls=no
sudo make install

Now clone fsharp, build and install it.

git clone https://github.com/fsharp/fsharp
cd fsharp
./autogen.sh --prefix=/mono64
sudo make install

Finally get the binary executable paths added to the paths file.

vi /etc/paths

Add the following paths to the paths file.


Once that’s done, run the tests to confirm everything has built right and is operable.

cd tests/fsharp/core

Now… that should all be ok.


What I wanted now is something to sling some code and execute it. The easiest way, is to use the ‘fsharpi’ repl. At the OS-X terminal launch the repl.
Enter this line…

let x = 5;;

Then let y to a value…

let y = 20;;

Then enter…

y + x;;

…and you should see the math calculated. Then you can quit out of the repl with the following command.


The overall repl should come out looking like this.

> let x = 5;;

val x : int = 5

> let y = 20;;

val y : int = 20

> y + x;;
val it : int = 25
> #quit;;

- Exit...

Compilation – A Step Further

Just to show one more step. Let’s do a compile of a file with F# Code in it. Create a file called process.fs and enter the following code.

open System

let main (argv :string[]) = 
    printfn "Hello World" 
    Console.ReadLine() |> ignore

Now run the compiler ‘fsharpc’.

fsharpc process.fs

Now before you freak out screaming “OMG WTF am I supposed to do with a process.exe file…!!!” just calm down and execute the following command.

mono process.exe

There you’ll see the execution of “Hello World”. Welcome to F# on OS-X. More to come, Keep thrashing code!

Note: I’ve got a github repo for this and coming F# coding available at sharpgrounds.

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