To compile and run on macOS:

Install XQuartz:

  $ brew cask install xquartz

Then run it from the terminal:

  $ open /Applications/Utilities/XQuartz.app

Clone libschrift from Github, then edit the file config.mk and update lines 14 and 15 as follows:

  X11INC = /opt/X11/include
  X11LIB = /opt/X11/lib

Then compile and run the demo:

  $ make
  $ export DISPLAY=":0"
  $ ./sftdemo

You should see a "Hello world" app.