Error installing allcountjs on vagrant box running ubuntu

[impactworldtour]

I have a new package.json project and I tried to install allcountjs but it failed:

$ npm install --save allcountjs
...
npm ERR! Linux 3.19.0-25-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "--save" "allcountjs"
npm ERR! node v5.12.0
npm ERR! npm  v3.8.6
npm ERR! path ../acorn/bin/acorn
npm ERR! code EPROTO
npm ERR! errno -71
npm ERR! syscall symlink

npm ERR! EPROTO: protocol error, symlink '../acorn/bin/acorn' -> '/vagrant/application/node_modules/.bin/acorn'
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!     <https://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     /vagrant/application/npm-debug.log

here are the last several entries from the npm-log

57172 verbose stack Error: EPROTO: protocol error, symlink '../acorn/bin/acorn' -> '/vagrant/application/node_modules/.bin/acorn'
57172 verbose stack     at Error (native)
57173 verbose cwd /vagrant/application
57174 error Linux 3.19.0-25-generic
57175 error argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "--save" "allcountjs"
57176 error node v5.12.0
57177 error npm  v3.8.6
57178 error path ../acorn/bin/acorn
57179 error code EPROTO
57180 error errno -71
57181 error syscall symlink
57182 error EPROTO: protocol error, symlink '../acorn/bin/acorn' -> '/vagrant/application/node_modules/.bin/acorn'
57183 error If you need help, you may report this error at:
57183 error     <https://github.com/npm/npm/issues>
57184 verbose exit [ -71, true ]

[impactworldtour]

I was able to install it with npm install allcountjs-cli --save --no-bin-links