Vagrantのsynced_folderでnpm installするとError: UNKNOWN, symlinkVagrantVirtualBoxnpm $ npm install yuicompressor npm ERR! Error: UNKNOWN, symlink '../yuicompressor/nodejs/cli.js' npm ERR! If you need help, you may report this *entire* log, npm ERR! including the npm and node versions, at: npm ERR! <http://github.com/npm/npm/issues> npm ERR! System Linux 2.6.32-573.el6.x86_64 npm ERR! command "/home/vag