Get optional macros only if we really can do it
Get optional macros only if we really can do it

elixir-lang/elixir,ggcampinho/elixir,pedrosnk/elixir,antipax/elixir,antipax/elixir,kelvinst/elixir,kimshrier/elixir,ggcampinho/elixir,kimshrier/elixir,beedub/elixir,pedrosnk/elixir,michalmuskala/elixir,lexmag/elixir,gfvcastro/elixir,gfvcastro/elixir,lexmag/elixir,joshprice/elixir,kelvinst/elixir,beedub/elixir