node-qrcode install on heroku
===

I got problem to install this package on heroku.
Is there a way to do it ?

I saw it's a problem with canvas module, but i don't know what to do.

This is a log of installation on heroku. I don't know how to get more :

    npm ERR! canvas@0.12.1 preinstall: `node-waf configure build`
           npm ERR! `sh "-c" "node-waf configure build"` failed with 1
           npm ERR! 
           npm ERR! Failed at the canvas@0.12.1 preinstall script.
           npm ERR! This is most likely a problem with the canvas package,
           npm ERR! not with npm itself.
           npm ERR! Tell the author that this fails on your system:
           npm ERR!     node-waf configure build
           npm ERR! You can get their info via:
           npm ERR!     npm owner ls canvas
           npm ERR! There is likely additional logging output above.
           
           npm ERR! System Linux 2.6.32-343-ec2
           npm ERR! command "/tmp/node-node-La1F/bin/node" "/tmp/node-npm-6Xts/cli.js" "install" "--production"
           npm ERR! cwd /tmp/build_3ejt8evom1p0g
           npm ERR! node -v v0.6.18
           npm ERR! npm -v 1.1.41
           npm ERR! code ELIFECYCLE
           npm ERR! stack Error: canvas@0.12.1 preinstall: `node-waf configure build`
           npm ERR! stack `sh "-c" "node-waf configure build"` failed with 1
           npm ERR! stack     at ChildProcess.<anonymous> (/tmp/node-npm-6Xts/lib/utils/exec.js:56:20)
           npm ERR! stack     at ChildProcess.emit (events.js:70:17)
           npm ERR! stack     at maybeExit (child_process.js:362:16)
           npm ERR! stack     at Process.onexit (child_process.js:398:5)

