Build OK but failed to run tests

Succesfully built with a fresh install of opencv@3 (which might or might fit opencv4nodejs's manual saying it must be in /usr/local). Yarn add seems happy.

````
$ brew install opencv@3

$ export LDFLAGS="-L/usr/local/opt/opencv@3/lib"
$ export CPPFLAGS="-I/usr/local/opt/opencv@3/include"
$ OPENCV4NODEJS_DISABLE_AUTOBUILD=1 yarn add opencv4nodejs

````

success Saved 1 new dependency.
info Direct dependencies
└─ opencv4nodejs@4.14.1

When I ran some actual tests, it fails with linking issue:

````
$ node scripts/test-opencv4nodejs.js
module.js:682
return process.dlopen(module, path._makeLong(filename));
^

Error: dlopen(/Users/wc/testproj/node_modules/opencv4nodejs/build/Release/opencv4nodejs.node, 1): Symbol not found: __ZNK2cv12MatAllocator3mapEPNS_8UMatDataEi
````

It looks to me that some hardwired path is still there, noticing that opencv is installed in /usr/local/opt/opencv@3/lib not /usr/local/lib. Any suggestions?

System: MacOS 10.13.3, Latest homebrew