Following https://github.com/rsms/inter/blob/master/CONTRIBUTING.md#compiling-font-files
$ make -j test
The program ‘make’ is currently not installed. It is provided by
several packages. You can install it by typing one of the following:
nix-env -iA nixos.gnumake
nix-env -iA nixos.gnumake42
$ nix-shell -p gnumake
$ make -j test
Makefile:102: build/etc/generated.make: No such file or directory
make: *** No rule to make target 'build/etc/generated.make'. Stop.
$ make -j Regular SemiBoldItalic
Makefile:102: build/etc/generated.make: No such file or directory
make: *** No rule to make target 'build/etc/generated.make'. Stop.