diff --git a/README.md b/README.md
index d768aba..cdd3f66 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ocaml-fmt
 
+OCaml Format pretty-printer combinators.
+
diff --git a/ocaml-fmt.spec b/ocaml-fmt.spec
new file mode 100644
index 0000000..b940074
--- /dev/null
+++ b/ocaml-fmt.spec
@@ -0,0 +1,74 @@
+%define ocamlpck  fmt
+
+Name:          ocaml-fmt
+Version:       0.9.0
+Release:       1mamba
+Summary:       OCaml Format pretty-printer combinators
+Group:         System/Libraries/OCaml
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://github.com/dbuenzli/fmt
+Source:        https://github.com/dbuenzli/fmt.git/v%{version}/fmt-%{version}.tar.bz2
+License:       ISC
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: ocaml
+BuildRequires: ocaml-cmdliner-devel
+BuildRequires: ocaml-compiler-libs
+BuildRequires: ocaml-runtime
+## 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 fmt-%{version}
+
+%build
+ocaml 'pkg/pkg.ml' build
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+opam-installer --prefix="%{buildroot}%{_prefix}" --libdir='%{buildroot}%{_libdir}/ocaml' --docdir='share/doc'
+
+rm -rf %{buildroot}/usr/doc
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%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
+%doc LICENSE*
+
+%files devel
+%defattr(-,root,root)
+%{_libdir}/ocaml/%{ocamlpck}/*.a
+%{_libdir}/ocaml/%{ocamlpck}/*.cmx
+%{_libdir}/ocaml/%{ocamlpck}/*.cmxa
+%{_libdir}/ocaml/%{ocamlpck}/*.mli
+%dir %{_docdir}/fmt
+%{_docdir}/fmt/*
+
+%changelog
+* Wed Jul 12 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 0.9.0-1mamba
+- package created using the webbuild interface