• Install Haskell Platform (latest version)
• Download QFeldspar from Github:
     > git clone https://github.com/shayan-najd/QFeldspar.git
• Update Cabal's local list of packages:
     > cabal update
• Install QFeldspar using cabal:
     > cd QFeldspar
     > cabal install
• [for Unix based systems only]
  For running files using GHCI, you possibly need to set the proper permissions for the downloaded files:
     >./setpermissions

Or alternatively, you can use the docker file (and the accompanying script for running it) provided at the repository:
https://raw.githubusercontent.com/shayan-najd/QFeldspar/master/Dockerfile
https://raw.githubusercontent.com/shayan-najd/QFeldspar/master/rundocker

Although we recommend Emacs for editing source files and viewing processed images, you can use your favorite Haskell code editor and image viewer (e.g. ImageMagick) that supports Netpbm format.