let muse =   let url =     "http://bioinformatics.mdanderson.org/Software/MuSE/MuSEv1.0b" in   let binary = "MuSEv1.0b" in   let install_program ~path =     KEDSL.Program.( shf "chmod +x %s/%s" path binary) in   let init_program ~path =     KEDSL.Program.(shf "export muse_bin=%s/%s" path binary) in   Installable_tool.make Machine.Tool.Default.muse ~url     ~install_program ~init_program     ~witness:(witness_file binary)