Warn when executables are missing, close #9037
Warn when executables are missing, close #9037

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