久々に raspberry pi へ google-home-notifier をインストールしようとしたら

使っていなかった raspberry pi へ google-home-notifier をインストールしようとしたら

npm install でエラー

sudo ではなく su で root になってから npm install する

# git clone https://github.com/noelportugal/google-home-notifier
# cd google-home-notifier
# npm install
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142

> mdns@2.5.1 install /google-home-notifier/node_modules/mdns
> node-gyp rebuild

gyp WARN EACCES current user ("USERNAME") does not have permission to access the dev dir "/root/.cache/node-gyp/10.20.1"
gyp WARN EACCES attempting to reinstall using temporary dev dir "/google-home-notifier/node_modules/mdns/.node-gyp"
gyp WARN install got an error, rolling back install
gyp WARN install got an error, rolling back install
gyp ERR! configure error 
gyp ERR! stack Error: EACCES: permission denied, mkdir '/google-home-notifier/node_modules/mdns/.node-gyp'
gyp ERR! System Linux 4.19.66+
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 /google-home-notifier/node_modules/mdns
gyp ERR! node -v v10.20.1
gyp ERR! node-gyp -v v5.1.0
gyp ERR! not ok 
npm WARN google-home-notifier@1.2.0 No repository field.

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! mdns@2.5.1 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the mdns@2.5.1 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2020-05-26....Z-debug.log