Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/skpm/node_modules/keytar/build'
I am getting an error when trying to install `skpm`. I tried to install it with admin privileges, but I still get the same error. 

Any ideas of what might be causing it?

```
prebuild-install info begin Prebuild-install version 2.5.1
prebuild-install info looking for local prebuild @ prebuilds/keytar-v4.2.1-node-v59-darwin-x64.tar.gz
prebuild-install WARN install EACCES: permission denied, access '/Users/diegooriani/.npm'
gyp ERR! configure error 
gyp ERR! stack Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/skpm/node_modules/keytar/build'
gyp ERR! System Darwin 17.5.0
gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /usr/local/lib/node_modules/skpm/node_modules/keytar
gyp ERR! node -v v9.4.0
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok 
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! keytar@4.2.1 install: `prebuild-install || node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the keytar@4.2.1 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
```