To build the source, you need Stack. The whole source is in Haskell and the package can be easily and reproducibly built with Stack.
stack setup # if you need to set up a GHC environment that is separate from your system stack build
You can use the executable file generated by Stack to perform a wide variety of tasks. For more information, run this command:
stack exec blog-src -h
To build the
.sass files, you will need to install the Sass executable.