root@AgarIO:~# npm install ws
-
> bufferutil@1.1.0 install /root/node_modules/ws/node_modules/bufferutil
> node-gyp rebuild

make: Entering directory `/root/node_modules/ws/node_modules/bufferutil/build'
  CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
make: g++: Command not found
make: *** [Release/obj.target/bufferutil/src/bufferutil.o] Error 127
make: Leaving directory `/root/node_modules/ws/node_modules/bufferutil/build'
gyp ERR! build error
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:269:23)
gyp ERR! stack     at ChildProcess.emit (events.js:110:17)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (child_process.js:1074:12)
gyp ERR! System Linux 3.13.0-52-generic
gyp ERR! command "node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /root/node_modules/ws/node_modules/bufferutil
gyp ERR! node -v v0.12.5
gyp ERR! node-gyp -v v2.0.1
gyp ERR! not ok

> utf-8-validate@1.1.0 install /root/node_modules/ws/node_modules/utf-8-validate
> node-gyp rebuild

make: Entering directory `/root/node_modules/ws/node_modules/utf-8-validate/build'
  CXX(target) Release/obj.target/validation/src/validation.o
make: g++: Command not found
make: *** [Release/obj.target/validation/src/validation.o] Error 127
make: Leaving directory `/root/node_modules/ws/node_modules/utf-8-validate/build'
gyp ERR! build error
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:269:23)
gyp ERR! stack     at ChildProcess.emit (events.js:110:17)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (child_process.js:1074:12)
gyp ERR! System Linux 3.13.0-52-generic
gyp ERR! command "node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /root/node_modules/ws/node_modules/utf-8-validate
gyp ERR! node -v v0.12.5
gyp ERR! node-gyp -v v2.0.1
gyp ERR! not ok
npm WARN optional dep failed, continuing bufferutil@1.1.0
npm WARN optional dep failed, continuing utf-8-validate@1.1.0
ws@0.7.2 node_modules/ws
├── options@0.0.6
└── ultron@1.0.2