diff --git a/README.md b/README.md
index 093d60a..ba6aafe 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ocaml-menhir
 
+An LR(1) parser generator for OCaml.
+
diff --git a/ocaml-menhir.spec b/ocaml-menhir.spec
new file mode 100644
index 0000000..40be05d
--- /dev/null
+++ b/ocaml-menhir.spec
@@ -0,0 +1,88 @@
+%define ocamlpck  menhirLib
+
+Name:          ocaml-menhir
+Version:       20211128
+Release:       1mamba
+Summary:       An LR(1) parser generator for OCaml
+Group:         System/Libraries/OCaml
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://gitlab.inria.fr:443/fpottier/menhir
+Source:        https://gitlab.inria.fr/fpottier/menhir.git/%{version}/menhir-%{version}.tar.bz2
+License:       LGPL
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: ocaml
+## AUTOBUILDREQ-END
+BuildRequires: dune
+BuildRequires: ocaml
+BuildRequires: ocaml-findlib
+
+%description
+%{summary}.
+
+%package devel
+Group:         Development/Libraries/OCaml
+Summary:       Development files for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%description devel
+This package contains libraries and signature files for developing applications that use %{name}.
+
+%debug_package
+
+%prep
+%setup -q -n menhir-%{version}
+
+%build
+dune build
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+DESTDIR=%{buildroot} dune install --prefix "/usr" --libdir "%{_lib}/ocaml"
+
+rm -rf %{buildroot}/usr/doc
+
+install -d -m0755 %{buildroot}%{_datadir}
+mv %{buildroot}/usr/man %{buildroot}%{_datadir}/
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/menhir
+%dir %{_libdir}/ocaml/%{ocamlpck}
+%{_libdir}/ocaml/%{ocamlpck}/*
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.a
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.cmx
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.cmxa
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.mli
+%dir %{_libdir}/ocaml/menhir
+%{_libdir}/ocaml/menhir/*
+%dir %{_libdir}/ocaml/coq-menhirlib
+%{_libdir}/ocaml/coq-menhirlib/*
+%dir %{_libdir}/ocaml/menhirSdk
+%{_libdir}/ocaml/menhirSdk/*
+%exclude %{_libdir}/ocaml/menhirSdk/*.a
+%exclude %{_libdir}/ocaml/menhirSdk/*.cmx
+%exclude %{_libdir}/ocaml/menhirSdk/*.cmxa
+%exclude %{_libdir}/ocaml/menhirSdk/*.mli
+%{_mandir}/man1/menhir.1*
+%doc LICENSE*
+
+%files devel
+%defattr(-,root,root)
+%{_libdir}/ocaml/%{ocamlpck}/*.a
+%{_libdir}/ocaml/%{ocamlpck}/*.cmx
+%{_libdir}/ocaml/%{ocamlpck}/*.cmxa
+%{_libdir}/ocaml/%{ocamlpck}/*.mli
+%{_libdir}/ocaml/menhirSdk/*.a
+%{_libdir}/ocaml/menhirSdk/*.cmx
+%{_libdir}/ocaml/menhirSdk/*.cmxa
+%{_libdir}/ocaml/menhirSdk/*.mli
+
+%changelog
+* Mon Feb 07 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 20211128-1mamba
+- package created using the webbuild interface