let samblaster =     let binary = "samblaster" in     Installable_tool.make       Machine.Tool.Default.samblaster       ~url:"https://github.com/GregoryFaust/samblaster/releases/download/v.0.1.22/samblaster-v.0.1.22.tar.gz"       ~install_program:(make_and_copy_bin binary)       ~init_program:add_to_dollar_path       ~witness:(witness_file binary)