I ran into some trouble installing the pdf-view package from @izuzak last night on Windows 8.1. It looks like one of the dependencies, pathwatcher, has some native code and requires compilation. node-gyp was failing since I didn’t have a compiler installed. Once I installed Visual Studio 2013 Express, both pathwatcher and pdf-view installed with no issue.
It appears that the markdown-preview (can’t add more links since I’m a new user!) package also uses pathwatcher. Yet, it shipped with my Atom binary and required no compilation on my part. Can packages use the pathwatcher that comes with Atom versus requiring the user to install a hefty package of developer tools to compile it?