GHCup

ghcup

The main installer for the Haskell Language Toolchain.

Runs as ghcup|macOS, Linux|www.haskell.org

Open form in Otty otty.toml

Command form

ai-draft · 2 tasks · 4 fields

Install a Haskell tool or choose the active version. Listing, removal, upgrade and the TUI are left out.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui ghcup

`ghcup install`

Install a tool

Install a toolExample values, fixed in this page — nothing here reaches a terminal

Basic

Tool*

string

Version or tag

string

TasksEach one presets the form for one job

Install

toolversion

ParametersOnly these flags are editable in the form

Tool

string · positional 0

ghccabal

Version or tag

Omit for recommended; latest and recommended are accepted tags.
string · positional 1

recommendedlatest

`ghcup set`

Set the active version

Set the active versionExample values, fixed in this page — nothing here reaches a terminal

Basic

Tool*

string

Version*

string

TasksEach one presets the form for one job

Set active

toolversion

ParametersOnly these flags are editable in the form

Tool

string · positional 0

ghccabal

Version

string · positional 1

SourcesEvery flag above is checked against these

guide

# install the recommended GHC version ghcup install ghc # install a specific GHC version ghcup install ghc 8.2.2 # install cabal-install ghcup install cabal All of the following are valid arguments to ghcup install ghc: latest, recommended If the argument is omitted, the default is recommended.

manual2026-10-27

www.haskell.org

guide

# set the currently "active" GHC version ghcup set ghc 8.4.4

manual2026-10-27

www.haskell.org

Before it fills your prompt, Otty checks the installed ghcup against its version. A form that does not match your version is not offered.