-----> Node.js app detected
-----> Creating runtime environment

       NPM_CONFIG_LOGLEVEL=error
       NPM_CONFIG_PRODUCTION=true
       NODE_VERBOSE=false
       NODE_ENV=production
       NODE_MODULES_CACHE=true
-----> Installing binaries
       engines.node (package.json):  unspecified
       engines.npm (package.json):   unspecified (use default)

       Resolving node version 6.x via semver.io...
       Downloading and installing node 6.10.1...
       Using default npm version: 3.10.10
-----> Restoring cache
       Loading 2 from cacheDirectories (default):
       - node_modules (exists - skipping)
       - bower_components (not cached - skipping)
-----> Building dependencies
       Prebuild detected (node_modules already exists)
       Rebuilding any native modules

       > iconv@2.2.1 install /tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/iconv
       > node-gyp rebuild

       make: Entering directory `/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/iconv/build'
       CXX(target) Release/obj.target/iconv/src/binding.o
       CC(target) Release/obj.target/iconv/deps/libiconv/lib/iconv.o
       SOLINK_MODULE(target) Release/obj.target/iconv.node
       COPY Release/iconv.node
       make: Leaving directory `/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/iconv/build'

       > node-icu-charset-detector@0.2.0 install /tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/node-icu-charset-detector
       > node-gyp rebuild

       make: Entering directory `/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/node-icu-charset-detector/build'
       CXX(target) Release/obj.target/node-icu-charset-detector/node-icu-charset-detector.o
       ../node-icu-charset-detector.cpp:7:28: fatal error: unicode/ucsdet.h: No such file or directory
       #include <unicode/ucsdet.h>
       ^
       compilation terminated.
       make: *** [Release/obj.target/node-icu-charset-detector/node-icu-charset-detector.o] Error 1
       make: Leaving directory `/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/node-icu-charset-detector/build'
       gyp ERR! build error
       gyp ERR! stack Error: `make` failed with exit code: 2
       gyp ERR! stack     at ChildProcess.onExit (/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/.heroku/node/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:276:23)
       gyp ERR! stack     at emitTwo (events.js:106:13)
       gyp ERR! stack     at ChildProcess.emit (events.js:191:7)
       gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)
       gyp ERR! System Linux 3.13.0-112-generic
       gyp ERR! command "/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/.heroku/node/bin/node" "/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/.heroku/node/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
       gyp ERR! cwd /tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/node_modules/node-icu-charset-detector
       gyp ERR! node -v v6.10.1
       gyp ERR! node-gyp -v v3.4.0
       gyp ERR! not ok

       npm ERR! Linux 3.13.0-112-generic
       npm ERR! argv "/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/.heroku/node/bin/node" "/tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/.heroku/node/bin/npm" "rebuild"
       npm ERR! node v6.10.1
       npm ERR! npm  v3.10.10
       npm ERR! code ELIFECYCLE
       npm ERR! node-icu-charset-detector@0.2.0 install: `node-gyp rebuild`
       npm ERR! Exit status 1
       npm ERR!
       npm ERR! Failed at the node-icu-charset-detector@0.2.0 install script 'node-gyp rebuild'.
       npm ERR! Make sure you have the latest version of node.js and npm installed.
       npm ERR! If you do, this is most likely a problem with the node-icu-charset-detector package,
       npm ERR! not with npm itself.
       npm ERR! Tell the author that this fails on your system:
       npm ERR!     node-gyp rebuild
       npm ERR! You can get information on how to open an issue for this project with:
       npm ERR!     npm bugs node-icu-charset-detector
       npm ERR! Or if that isn't available, you can get their info via:
       npm ERR!     npm owner ls node-icu-charset-detector
       npm ERR! There is likely additional logging output above.

       npm ERR! Please include the following file with any support request:
       npm ERR!     /tmp/build_874208d6a2ec85e57cf3fac77cb61bfa/npm-debug.log
-----> Build failed

       We're sorry this build is failing! You can troubleshoot common issues here:
       https://devcenter.heroku.com/articles/troubleshooting-node-deploys

       Some possible problems:

       - node_modules checked into source control
       https://blog.heroku.com/node-habits-2016#9-only-git-the-important-bits

       - Node version not specified in package.json
       https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version

       Love,
       Heroku

 !     Push rejected, failed to compile Node.js app.
 !     Push failed