private fun install_from_git(git_repo, name: String, version: nullable String)
	do
		check_git

		var target_dir = nitpm_lib_dir / name
		if version != null then target_dir += "=" + version
		if installed.has(target_dir) then
			# Ignore packages installed in this run
			return
		end
		installed.add target_dir

		if target_dir.file_exists then
			# Warn about packages previously installed,
			# install dependencies anyway in case of a previous error.
			print_error "Package '{name}' is already installed"
		else
			# Actually install it
			var cmd_branch = ""
			if version != null then cmd_branch = "--branch '{version}'"

			var cmd = "git clone --depth 1 {cmd_branch} {git_repo.escape_to_sh} {target_dir.escape_to_sh}"
			if verbose then print "+ {cmd}"

			if "NIT_TESTING".environ == "true" then
				# Silence git output when testing
				cmd += " 2> /dev/null"
			end

			var proc = new Process("sh", "-c", cmd)
			proc.wait

			if proc.status != 0 then
				print_error "Install of '{name}' failed"
				exit 1
			end
		end

		# Recursive install
		var ini = new IniFile.from_file(target_dir/"package.ini")
		var import_line = ini["package.import"]
		if import_line != null then
			install_packages import_line
		end
	end