If i follow the list: 

You can add the package with Pkg.clone("
https://github.com/SimonDanisch/GLPlot.jl";)

> Pkg.clone("https://github.com/SimonDanisch/GLWindow.jl.git";) 
> Pkg.clone("https://github.com/SimonDanisch/GLAbstraction.jl.git";) 
> Pkg.clone("https://github.com/JuliaGL/ModernGL.jl.git";)
>

then i get a:
 julia> Pkg.clone("https://github.com/SimonDanisch/GLAbstraction.jl.git";)
INFO: Cloning GLAbstraction from 
https://github.com/SimonDanisch/GLAbstraction.jl.git
INFO: Computing changes...
ERROR: unknown package ModernGL required by GLAbstraction

, so ModernGl should come first.

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