node-qrcode install on heroku - node.js

Question

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)

Answer 1

I successfully used this Heroku builpack:
https://elements.heroku.com/buildpacks/mojodna/heroku-buildpack-cairo
But in its README, it tells you to use heroku-buildpack-multi, that's deprecated. What I did was, using Heroku Toolbelt in command line:
heroku buildpacks:set --index 1 https://github.com/mojodna/heroku-buildpack-cairo.git
heroku buildpacks:add heroku/nodejs
And then push to Heroku so it can build packages again.