--- /dev/null
+#
+# Conditional build:
+%bcond_without ocaml_opt # native optimized binaries (bytecode is always built)
+
+# not yet available on x32 (ocaml 4.02.1), update when upstream will support it
+%ifnarch %{ix86} %{x8664} %{arm} aarch64 ppc sparc sparcv9
+%undefine with_ocaml_opt
+%endif
+
+Summary: OCaml variants as first class values
+Summary(pl.UTF-8): OCamlowe warianty jako wartości pierwszoklasowe
+Name: ocaml-variantslib
+Version: 0.14.0
+Release: 1
+License: MIT
+Group: Libraries
+#Source0Download: https://github.com/janestreet/variantslib/tags
+Source0: https://github.com/janestreet/variantslib/archive/v%{version}/variantslib-%{version}.tar.gz
+# Source0-md5: a8ce0a10f2a52fc81caa7d68431c5d31
+URL: https://github.com/janestreet/variantslib
+BuildRequires: ocaml >= 1:4.04.2
+BuildRequires: ocaml-base-devel >= 0.14
+BuildRequires: ocaml-base-devel < 0.15
+BuildRequires: ocaml-dune >= 2.0.0
+%requires_eq ocaml-runtime
+BuildRoot: %{tmpdir}/%{name}-%{version}-root-%(id -u -n)
+
+%define debug_package %{nil}
+
+%description
+OCaml variants as first class values.
+
+This package contains files needed to run bytecode executables using
+variantslib library.
+
+%description -l pl.UTF-8
+OCamlowe warianty jako wartości pierwszoklasowe.
+
+Pakiet ten zawiera binaria potrzebne do uruchamiania programów
+używających biblioteki variantslib.
+
+%package devel
+Summary: OCaml variants as first class values - development part
+Summary(pl.UTF-8): OCamlowe warianty jako wartości pierwszoklasowe - cześć programistyczna
+Group: Development/Libraries
+Requires: %{name} = %{version}-%{release}
+%requires_eq ocaml
+Requires: ocaml-base-devel >= 0.14
+
+%description devel
+This package contains files needed to develop OCaml programs using
+variantslib library.
+
+%description devel -l pl.UTF-8
+Pakiet ten zawiera pliki niezbędne do tworzenia programów w OCamlu
+używających biblioteki variantslib.
+
+%prep
+%setup -q -n variantslib-%{version}
+
+%build
+dune build --verbose
+
+%install
+rm -rf $RPM_BUILD_ROOT
+
+dune install --destdir=$RPM_BUILD_ROOT
+
+# sources
+%{__rm} $RPM_BUILD_ROOT%{_libdir}/ocaml/variantslib/*.ml
+# packaged as %doc
+%{__rm} -r $RPM_BUILD_ROOT%{_prefix}/doc/variantslib
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%files
+%defattr(644,root,root,755)
+%doc CHANGES.md LICENSE.md
+%dir %{_libdir}/ocaml/variantslib
+%{_libdir}/ocaml/variantslib/META
+%{_libdir}/ocaml/variantslib/*.cma
+%if %{with ocaml_opt}
+%attr(755,root,root) %{_libdir}/ocaml/variantslib/*.cmxs
+%endif
+
+%files devel
+%defattr(644,root,root,755)
+%{_libdir}/ocaml/variantslib/*.cmi
+%{_libdir}/ocaml/variantslib/*.cmt
+%if %{with ocaml_opt}
+%{_libdir}/ocaml/variantslib/variantslib.a
+%{_libdir}/ocaml/variantslib/*.cmx
+%{_libdir}/ocaml/variantslib/*.cmxa
+%endif
+%{_libdir}/ocaml/variantslib/dune-package
+%{_libdir}/ocaml/variantslib/opam