--- /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: Syntax extension to define first class values representing record fields
+Summary(pl.UTF-8): Rozszerzenie składni do definiowania pierwszoklasowych wartości reprezentujących pola rekordów
+Name: ocaml-fieldslib
+Version: 0.14.0
+Release: 1
+License: MIT
+Group: Libraries
+#Source0Download: https://github.com/janestreet/fieldslib/tags
+Source0: https://github.com/janestreet/fieldslib/archive/v%{version}/fieldslib-%{version}.tar.gz
+# Source0-md5: bda1a5ab1175366f77d6bcf43680c547
+URL: https://github.com/janestreet/fieldslib
+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
+Syntax extension to define first class values representing record
+fields, to get and set record fields, iterate and fold over all fields
+of a record and create new record values.
+
+This package contains files needed to run bytecode executables using
+fieldslib library.
+
+%description -l pl.UTF-8
+Rozszerzenie składni do definiowania pierwszoklasowych wartości
+reprezentujących pola rekordów, do pobierania i ustawiania pól
+rekordów, iterowania i składania wszystkich pól rekordów oraz
+tworzenia nowych wartości rekordów.
+
+Pakiet ten zawiera binaria potrzebne do uruchamiania programów
+używających biblioteki fieldslib.
+
+%package devel
+Summary: Generation of comparison functions from types - development part
+Summary(pl.UTF-8): Generowanie funkcji porównujących z typów - 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
+fieldslib library.
+
+%description devel -l pl.UTF-8
+Pakiet ten zawiera pliki niezbędne do tworzenia programów w OCamlu
+używających biblioteki fieldslib.
+
+%prep
+%setup -q -n fieldslib-%{version}
+
+%build
+dune build --verbose
+
+%install
+rm -rf $RPM_BUILD_ROOT
+
+dune install --destdir=$RPM_BUILD_ROOT
+
+# sources
+%{__rm} $RPM_BUILD_ROOT%{_libdir}/ocaml/fieldslib/*.ml
+# packaged as %doc
+%{__rm} -r $RPM_BUILD_ROOT%{_prefix}/doc/fieldslib
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%files
+%defattr(644,root,root,755)
+%doc CHANGES.md LICENSE.md
+%dir %{_libdir}/ocaml/fieldslib
+%{_libdir}/ocaml/fieldslib/META
+%{_libdir}/ocaml/fieldslib/*.cma
+%if %{with ocaml_opt}
+%attr(755,root,root) %{_libdir}/ocaml/fieldslib/*.cmxs
+%endif
+
+%files devel
+%defattr(644,root,root,755)
+%{_libdir}/ocaml/fieldslib/*.cmi
+%{_libdir}/ocaml/fieldslib/*.cmt
+%if %{with ocaml_opt}
+%{_libdir}/ocaml/fieldslib/fieldslib.a
+%{_libdir}/ocaml/fieldslib/*.cmx
+%{_libdir}/ocaml/fieldslib/*.cmxa
+%endif
+%{_libdir}/ocaml/fieldslib/dune-package
+%{_libdir}/ocaml/fieldslib/opam