# Search the `nitc` compiler to use
	#
	# If not `nitc` is suitable, then prints an error and quit.
	fun find_nitc: String
	do
		var nitc = opt_nitc.value
		if nitc != null then
			if not nitc.file_exists then
				fatal_error(null, "error: cannot find `{nitc}` given by --nitc.")
				abort
			end
			return nitc
		end

		nitc = "NITC".environ
		if nitc != "" then
			if not nitc.file_exists then
				fatal_error(null, "error: cannot find `{nitc}` given by NITC.")
				abort
			end
			return nitc
		end

		var nit_dir = nit_dir or else "."
		nitc = nit_dir / "bin/nitc"
		if not nitc.file_exists then
			fatal_error(null, "Error: cannot find nitc. Set envvar NIT_DIR or NITC or use the --nitc option.")
			abort
		end
		return nitc
	end