Error easy-captcha npm installing in sailsJS <p>I have run on terminal to install easy-captcha for my app. </p> <pre><code>npm install easy-captcha --save </code></pre> <p>and error appeared:</p> <pre><code>gyp ERR! build error gyp ERR! stack Error: `make` failed with exit code: 2 gyp ERR! stack at ChildProcess.onExit (/home/haihv94/Applications/nodejs/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 3.19.0-25-generic gyp ERR! command "node" "/home/haihv94/Applications/nodejs/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild" gyp ERR! cwd /home/haihv94/NDM/ndm.org/node_modules/easy-captcha gyp ERR! node -v v0.12.7 gyp ERR! node-gyp -v v2.0.1 gyp ERR! not ok npm ERR! Linux 3.19.0-25-generic npm ERR! argv "/home/haihv94/Applications/nodejs/bin/node" "/home/haihv94/Applications/nodejs/bin/npm" "install" "easy-captcha" "--save" npm ERR! node v0.12.7 npm ERR! npm v2.11.3 npm ERR! code ELIFECYCLE npm ERR! easy-captcha@0.1.5 install: `node-gyp rebuild` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the easy-captcha@0.1.5 install script 'node-gyp rebuild'. npm ERR! This is most likely a problem with the easy-captcha 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 their info via: npm ERR! npm owner ls easy-captcha npm ERR! There is likely additional logging output above. npm ERR! Please include the following file with any support request: npm ERR! /home/haihv94/NDM/ndm.org/npm-debug.log </code></pre> <p>I've tried installing another npm to using captcha (s.a recaptcha, node-captcha) but same error! How can I solve this problem? thanks all!</p>