Heroku fails to install node-sass

gistfile1.txt

13740 info build /tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/node_modules/gulp-sass
13741 info preinstall gulp-sass@0.7.2
13742 verbose linkStuff [ false,
13742 verbose linkStuff   false,
13742 verbose linkStuff   false,
13742 verbose linkStuff   '/tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/node_modules' ]
13743 info linkStuff gulp-sass@0.7.2
13744 verbose linkBins gulp-sass@0.7.2
13745 verbose linkMans gulp-sass@0.7.2
13746 verbose rebuildBundles gulp-sass@0.7.2
13747 verbose rebuildBundles [ '.bin', 'gulp-util', 'map-stream', 'node-sass' ]
13748 info install gulp-sass@0.7.2
13749 info postinstall gulp-sass@0.7.2
13750 info build /tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/node_modules/gulp-sass/node_modules/node-sass
13751 info preinstall node-sass@0.9.3
13752 verbose linkStuff [ false,
13752 verbose linkStuff   false,
13752 verbose linkStuff   false,
13752 verbose linkStuff   '/tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/node_modules/gulp-sass/node_modules' ]
13753 info linkStuff node-sass@0.9.3
13754 verbose linkBins node-sass@0.9.3
13755 verbose link bins [ { 'node-sass': 'bin/node-sass' },
13755 verbose link bins   '/tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/node_modules/gulp-sass/node_modules/.bin',
13755 verbose link bins   false ]
13756 verbose linkMans node-sass@0.9.3
13757 verbose rebuildBundles node-sass@0.9.3
13758 verbose rebuildBundles [ '.bin',
13758 verbose rebuildBundles   'chalk',
13758 verbose rebuildBundles   'mkdirp',
13758 verbose rebuildBundles   'mocha',
13758 verbose rebuildBundles   'nan',
13758 verbose rebuildBundles   'node-watch',
13758 verbose rebuildBundles   'optimist',
13758 verbose rebuildBundles   'shelljs',
13758 verbose rebuildBundles   'sinon' ]
13759 info install node-sass@0.9.3
13760 verbose unsafe-perm in lifecycle true
13761 info node-sass@0.9.3 Failed to exec install script
13762 error node-sass@0.9.3 install: `node build.js`
13762 error Exit status 1
13763 error Failed at the node-sass@0.9.3 install script.
13763 error This is most likely a problem with the node-sass package,
13763 error not with npm itself.
13763 error Tell the author that this fails on your system:
13763 error     node build.js
13763 error You can get their info via:
13763 error     npm owner ls node-sass
13763 error There is likely additional logging output above.
13764 error System Linux 3.8.11-ec2
13765 error command "/tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/vendor/node/bin/node" "/tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0/vendor/node/bin/npm" "rebuild"
13766 error cwd /tmp/build_321c4633-54c2-4d0a-aff0-335d6f5953b0
13767 error node -v v0.10.29
13768 error npm -v 1.4.14
13769 error code ELIFECYCLE
13770 verbose exit [ 1, true ]

 !     Push rejected, failed to compile Node.js app