INSTALLING GEMS

The install command downloads and installs the gem and any necessary dependencies then builds documentation for the installed gems.

$ gem install drip
Fetching drip-0.1.1.gem
Fetching rbtree-0.4.5.gem
Building native extensions. This could take a while...
Successfully installed rbtree-0.4.5
Successfully installed drip-0.1.1
Parsing documentation for rbtree-0.4.5
Installing ri documentation for rbtree-0.4.5
Parsing documentation for drip-0.1.1
Installing ri documentation for drip-0.1.1
Done installing documentation for rbtree, drip after 0 seconds
2 gems installed

Here the drip command depends upon the rbtree gem which has an extension. Ruby installs the dependency rbtree and builds its extension, installs the drip gem, then builds documentation for the installed gems.

You can disable documentation generation using the --no-document argument when installing gems.