How to install meteor package direct from github

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6

I must be stupid but I can’t get this to work

$ cd packages
$ git clone git@github.com:greggman/meteor-disqus.git
$ cd ..
$ meteor add greggman:meteor-disqus
=> Errors while parsing arguments:           
                                          
While adding package greggman:meteor-disqus:
error: no such package

$ meteor add package:greggman/meteor-disqus
=> Errors while parsing arguments:           
                                          
While adding package package:greggman/meteor-disqus:
error: Package names can only contain lowercase ASCII alphanumerics, dash, dot, or colon, not "/".

$ meteor add package:meteor-disqus
=> Errors while parsing arguments:           
                                          
While adding package package:meteor-disqus:
error: no such package

$ meteor add meteor-disqus
=> Errors while parsing arguments:           
                                          
While adding package meteor-disqus:
error: no such package
$ ls packages
meteor-disqus

What am I doing wrong?