Why yarn build node-gyp deps at each install?

[sc0rp10]

Now yarn rebuild binary deps at each install that stole my time and heat my CPU.
Why yarn doing it?

$ yarn --version
0.21.3
$ cat package.json
{
  "name": "test",
  "dependencies": {
    "bcrypt": "^0.8.7"
  }
}

What is the current behavior?
Binary deps builds at each install.
If the current behavior is a bug, please provide the steps to reproduce.

rm -rf node_modules
yarn install # first node-gyp compilation. it's ok
rm -rf node_modules
yarn install # why does it run compilation again?

What is the expected behavior?
Cache built .o files at shared cache directory

[Daniel15]

This is probably a duplicate of #932

[arcanis]

Closing this as a duplicate of #932