To see an example look here.

To compile Eschelle you need:

cmake, make, & 1 of (clang, gcc, vsc++)

Then cd into the repository directory and run the following:

mkdir build
(cd build && cmake .. && make)

After you build Eschelle you can run it with:

./Eschelle /path/to/esch/code

Example:

./Eschelle ../Example.esch