CS 3040: Installing Glasgow Haskell Compiler

Windows Users

Directions for Mac and Linux users are given at the bottom.

Install Chocolatey:
1. Visit https://chocolatey.org/install (or go to https://chocolatey.org and click on Get Started)
2. You can skip the Chocolatey Newsletter prompt.
3. Follow the steps for the Individual installation using Windows PowerShell. In particular:
  1. Click on the Windows Start icon, type "PowerShell", and select Run as Administrator
  2. Type Set-ExecutionPolicy AllSigned and hit return.
  3. Click on the clipboard icon to copy the command and paste it into the PowerShell prompt.
4. Close the PowerShell Prompt.
5. Open a new elevated prompt. You can re-open PowerShell (as administrator) or right click on the Command Prompt icon in the Start menu, select More, then select Run as administrator. Type
```
            choco  
```
  If you get a command not found error, ask for help.
To install Haskell:
1. Open a command prompt with administrator access.
2. Type
```
        choco install -y haskell-dev
        refreshenv
```
3. Confirm it's running:
```
        ghci
```

If it is not working correctly, you may wish to reboot your laptop. This would ensure the PATH variable is correct in all environments.

If you get the error "user specified .o/.so/.DLL could not be loaded (addDLL: pthread or dependencies not loaded. (Win32 error 5))", one solution is run ghci as administrator, but better is to change the security settings for c:\Windows\System32\pthread.dll and add a permission for "Users" to read & execute the dll. The system will ask about granting permissions to folders, but this is a spurious warning (you're just changing a file) and it can be ignored.

Note you can now type choco install -y xyz or cinst -y xyz to install other packages. If you enter

       choco feature enable -n=allowGlobalConfirmation

then you don't have to give the -y option or affirm installation. Packages to consider:

gow - Gnu on Windows; provides most Gnu Linux commands like grep, egrep, ls, cat, etc.
g++ - this is my preferred way to install G++ (for C++) on Windows
vim - Dr. Taylor's favorite editor
virtualbox
notepadplusplus
unzip - allows typing unzip at the command prompt to unpack Zip files

A win of using Chocolatey is you can update all packages with

cup
  all

Mac Users

The simplest way is

        brew install ghc

However, a distributed installer is also available; see the distribution_packages page

Ubuntu/Linux Users

apt-get should likely work. There are also distribution packages here.