julia> Pkg.add("SFML")
INFO: Cloning cache of SFML from https://github.com/zyedidia/SFML.jl.git
INFO: Installing SFML v0.2.0
INFO: Building WinRPM
INFO: Downloading https://cache.julialang.org/http://download.opensuse.org/repositories/windows:/mingw:/win32/openSUSE
eap_42.2/repodata/repomd.xml
INFO: Downloading https://cache.julialang.org/http://download.opensuse.org/repositories/windows:/mingw:/win64/openSUSE
eap_42.2/repodata/repomd.xml
INFO: Building SFML
====================================================[ ERROR: SFML ]===================================================
LoadError: UndefVarError: @windows_only not defined
while loading C:\Users\Paul\.julia\v0.6\SFML\deps\build.jl, in expression starting on line 1
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