npm dependency in cloud functions - node.js

Question

I've defined my npm dependency in the package.json file:
{
"name": "phash-hamming",
"version": "0.0.1",
"dependencies": {
"phash-image": "3.5.0"
}
}
In my index.js the first line causes an error:
var phash = require('phash-image');
The Error:
Build failed: exit status 1
phash-image#3.5.0 install /workspace/node_modules/phash-image
node-gyp rebuild
/bin/sh: 1: pkg-config: not found gyp: Call to 'pkg-config
--libs-only-L --libs-only-other pHash' returned exit status 127 while in binding.gyp. while trying to load binding.gyp gyp ERR! configure
error gyp ERR! stack Error: gyp failed with exit code: 1 gyp ERR!
stack at ChildProcess.onCpExit
(/nodejs/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:305:16)
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:219:12)
gyp ERR! System Linux 4.4.0-116-generic gyp ERR! command
"/nodejs/bin/node"
"/nodejs/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js"
"rebuild" gyp ERR! cwd /workspace/node_modules/phash-image gyp ERR!
node -v v6.11.5 gyp ERR! node-gyp -v v3.4.0 gyp ERR! not ok

Answer 1

https://github.com/mgmtio/phash-image
Read the Installation section.
phash-image depends on CImg, pHash, ImageMagicK.
Do you have install one of above?

Answer 2

The following worked for me:
1.Load the phash-image library from inside the function you are calling.
2.Use the package.json from the phash-image repo.
Your index.js:
exports.helloWorld = (req, res) => {
var phash = require('phash-image');
};
Your package.json:
{
"name": "phash-image",
"version": "3.5.0",
"description": "phash for images",
"repository": "mgmtio/phash-image",
"devDependencies": {
"bluebird": "^3.1.5",
"hamming-distance": "^1.0.0",
"istanbul": "^0.4.2",
"mocha": "^3.0.0",
"node-gyp": "^3.3.0"
},
"script": {
"preinstall": "node-gyp configure build",
"preuninstall": "rm -rf build/*"
},
"scripts": {
"build": "node-gyp configure build",
"test": "npm run build && mocha",
"test-cov": "npm run build && istanbul cover node_modules/mocha/bin/_mocha -- --reporter dot",
"test-travis": "npm run build && istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --reporter dot"
},
"keywords": [
"pHash",
"phash",
"libpHash",
"native",
"binding",
"addon"
],
"author": "Aaron Marasco <agm257#mail.missouri.edu>",
"contributors": [
"Aaron Marasco <agm257#mail.missouri.edu>",
"Taeho Kim <xissysnd#gmail.com>",
"Jeremy Dowell <jeremy#codevinsky.com>",
"Rod Vagg <r#va.gg> (https://github.com/rvagg)",
"Jonathan Ong <me#jongleberry.com> (https://github.com/jonathanong)"
],
"dependencies": {
"any-promise": "^1.1.0",
"nan": "^2.0.5"
},
"license": "MIT"
}