{ stdenv, fetchzip, pkgconfig, ncurses, libev, buildDunePackage, ocaml , cppo, ocaml-migrate-parsetree, ppx_tools_versioned, result }: let inherit (stdenv.lib) optional versionAtLeast; in buildDunePackage rec { pname = "lwt"; version = "4.1.0"; src = fetchzip { url = "https://github.com/ocsigen/${pname}/archive/${version}.tar.gz"; sha256 = "16wnc61kfj54z4q8sn9f5iik37pswz328hcz3z6rkza3kh3s6wmm"; }; nativeBuildInputs = [ pkgconfig ]; buildInputs = [ cppo ocaml-migrate-parsetree ppx_tools_versioned ] ++ optional (!versionAtLeast ocaml.version "4.07") ncurses; propagatedBuildInputs = [ libev result ]; configurePhase = "ocaml src/util/configure.ml -use-libev true"; meta = { homepage = "https://ocsigen.org/lwt/"; description = "A cooperative threads library for OCaml"; maintainers = [ stdenv.lib.maintainers.vbgl ]; license = stdenv.lib.licenses.lgpl21; }; }