Cabal 
This Cabal Git repository contains the following packages:
- Cabal: the Cabal library package (license)
- cabal-install: the package containing the
cabaltool (license)
The canonical upstream repository is located at
https://github.com/haskell/cabal.
Installing Cabal (by downloading the binary)
Prebuilt binary releases can be obtained from https://www.haskell.org/cabal/download.html.
The cabal-install binary download for your platform should contain the cabal executable.
Installing Cabal (with cabal)
Assuming that you have a pre-existing, older version of cabal-install,
run:
cabal install cabal-install
To get the latest version of cabal-install. (You may want to cabal update first.)
To install the latest version from the Git repository, clone the
Git repository and then run:
(cd Cabal; cabal install)
(cd cabal-install; cabal install)
Installing Cabal (without cabal)
Assuming you don't have a pre-existing copy of cabal-install, run:
cabal-install $ ./bootstrap.sh # running ./bootstrap.sh from within in cabal-install folder.
For more details, and non-unix like systems, see the README.md in cabal-install and Contributing Guidelines.