let sambamba =
Installable_tool.make
Machine.Tool.Default.sambamba
~archive_is_directory:false
~url:"https://github.com/lomereiter/sambamba/releases/download/v0.6.5/sambamba_v0.6.5_linux.tar.bz2"
~init_program:add_to_dollar_path
~witness:(witness_file "sambamba_v0.6.5")