After downloading the latest darcs version (2.14.1 release) using Safari, it is time to extract the files, check the integrity of the download and to install it. cd $HOME/Downloads tar -xvzf darcs-2.14.1.tar.gz shasum -a 256 darcs Should be : a0b5150a43b8a2898ea862e937feafca696d528f08ed9d66dca5f3bf80f5544c shasum -a 256 darcs.1 Should be : 74cfd6d6e162819f502bab69ce6505b311b1bc99496cb0d488cf449328d66067 If you already installed the Haskell Platform, you can use ghci to check the output using. ghci "Your SHA256 result" == "My SHA256 result" If the checksums match, copy the files in place using. cp ./darcs $HOME/Library/Haskell/bin/ cp ./darcs.1 $HOME/Library/Haskell/share/man/man1/ The above steps can be done in Terminal as shown or, in the Finder.