# Compile a unit file and return the compiler return code
	#
	# Can terminate the program if the compiler is not found
	private fun compile_unitfile(file: String): Int
	do
		var mmodule = self.mmodule
		var nitc = toolcontext.find_nitc
		var opts = new Array[String]
		if mmodule != null then
			# FIXME playing this way with the include dir is not safe nor robust
			opts.add "-I {mmodule.filepath.as(not null).dirname}"
		end
		var cmd = "{nitc} --ignore-visibility --no-color -q '{file}' {opts.join(" ")} >'{file}.out1' 2>&1 </dev/null -o '{file}.bin'"
		var res = toolcontext.safe_exec(cmd)
		return res
	end