I've tried installing from npm as well as building from source, and all installs fail during the preinstall script. I've tried using Node 0.12, 4.4.5, and 6.3.1 (switching with NVM). I think that this issue is different from #1037 (at least as that one was originally reported), because that issue shows up while executing install, not preinstall. Some of the most recent comments in that issue seem to match my problem, though.

The preinstall script seems to throw errors while Configuring libssh2:

configure: error: cannot find OpenSSL or Libgcrypt,