Why am I getting the "gyp ERR! stack Error: EACCES: permission denied" error when installing Hyplerledger Composer REST API Server?

You may get the "gyp ERR! stack Error: EACCES: permission denied" error, when using older version of "npm" to install Hyplerledger Composer REST API server:

$ sudo npm install -g composer-rest-server@0.20

...
gyp ERR! configure error
gyp ERR! stack Error: EACCES: permission denied, mkdir 
  '/usr/local/lib/node_modules/composer-rest-server/node_modules/pkcs11js/.node-gyp'
gyp ERR! System Linux 4.15.0-1037-azure
gyp ERR! command "/usr/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/composer-rest-server/node_modules/pkcs11js
gyp ERR! node -v v8.10.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! pkcs11js@1.0.17 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the pkcs11js@1.0.17 install script.

What you can do is to try it again with the "--unsafe-perm=true" option:

$ sudo npm install -g composer-rest-server --unsafe-perm=true

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