Have you considered this?
"GLFW downloads the binaries under windows completely automatically, for 
linux it tries to build them but fails if you don't have xorg-dev, 
libglu1-mesa-dev and cmake present.
For OSX, you need to use homebrew, or something comparable."
If you're not on OSX, it should either work, or print an error message... 
You might also want to run Pkg.build()

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