diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..22f6409
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/mtime-*.tbz
diff --git a/README.md b/README.md
index 080b11b..dcba3db 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,12 @@
 # ocaml-mtime
 
-The ocaml-mtime package
+[Mtime](https://erratique.ch/software/mtime) has platform independent support
+for monotonic wall-clock time in pure OCaml.  This time increases
+monotonically and is not subject to operating system calendar time
+adjustments.  The library has types to represent nanosecond precision
+timestamps and time spans.
+
+The additional `Mtime_clock` library provide access to a system monotonic
+clock.
+
+Mtime has no dependencies.  `Mtime_clock` depends on your system library.
diff --git a/ocaml-mtime.spec b/ocaml-mtime.spec
new file mode 100644
index 0000000..ebe7f55
--- /dev/null
+++ b/ocaml-mtime.spec
@@ -0,0 +1,102 @@
+%ifnarch %{ocaml_native_compiler}
+%global debug_package %{nil}
+%endif
+
+%global srcname mtime
+
+Name:           ocaml-%{srcname}
+Version:        1.3.0
+Release:        1%{?dist}
+Summary:        Monotonic wall-clock time for OCaml
+
+License:        ISC
+URL:            https://erratique.ch/software/mtime
+Source0:        %{url}/releases/%{srcname}-%{version}.tbz
+
+BuildRequires:  ocaml >= 4.03.0
+BuildRequires:  ocaml-findlib
+BuildRequires:  ocaml-ocamlbuild
+BuildRequires:  ocaml-topkg-devel
+
+%description
+Mtime has platform independent support for monotonic wall-clock time in
+pure OCaml.  This time increases monotonically and is not subject to
+operating system calendar time adjustments.  The library has types to
+represent nanosecond precision timestamps and time spans.
+
+The additional Mtime_clock library provide access to a system
+monotonic clock.
+
+Mtime has no dependencies.  Mtime_clock depends on your system library.
+
+%package        devel
+Summary:        Development files for %{name}
+Requires:       %{name}%{?_isa} = %{version}-%{release}
+
+%description    devel
+The %{name}-devel package contains libraries and signature
+files for developing applications that use %{name}.
+
+%prep
+%autosetup -n %{srcname}-%{version}
+
+%build
+ocaml pkg/pkg.ml build --with-js_of_ocaml false
+
+# Relink with Fedora linker flags
+cd _build
+ocamlopt -shared -linkall -cclib '%{build_ldflags} -lm' -I src src/mtime.cmxa \
+  -g -o src/mtime.cmxs
+ocamlfind ocamlopt -shared -linkall -cclib '%{build_ldflags}' -package \
+  compiler-libs.toplevel -I src src/mtime_top.cmxa -g -o src/mtime_top.cmxs
+ocamlmklib -ldopt '%{build_ldflags}' -o src-os/mtime_clock_stubs -g \
+  src-os/mtime_clock_stubs.o
+ocamlopt -shared -linkall -cclib '%{build_ldflags}' src-os/libmtime_clock_stubs.a -I src-os src-os/mtime_clock.cmxa -o src-os/mtime_clock.cmxs
+cd -
+
+%install
+mkdir -p %{buildroot}%{_libdir}/ocaml/%{srcname}/os
+cp -p _build/src/*.{a,cma,cmi,cmt,cmti,cmx,cmxa,cmxs,mli} _build/pkg/META \
+   _build/opam %{buildroot}%{_libdir}/ocaml/%{srcname}
+cp -p _build/src-os/*.{a,cma,cmi,cmt,cmti,cmx,cmxa,cmxs,mli} \
+   %{buildroot}%{_libdir}/ocaml/%{srcname}/os
+mkdir -p %{buildroot}%{_libdir}/ocaml/stublibs
+cp -p _build/src-os/*.so %{buildroot}%{_libdir}/ocaml/stublibs
+
+# The tests depend on js_of_ocaml, which we currently do not have in Fedora.
+# If we bring that package back (we used to have it, long ago), then enable the
+# tests.
+#
+#%%check
+#ocaml pkg/pkg.ml test
+
+%files
+%doc CHANGES.md README.md
+%license LICENSE.md
+%dir %{_libdir}/ocaml/%{srcname}/
+%dir %{_libdir}/ocaml/%{srcname}/os/
+%{_libdir}/ocaml/%{srcname}/META
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cma
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cmi
+%ifarch %{ocaml_native_compiler}
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cmxs
+%endif
+%{_libdir}/ocaml/stublibs/*.so
+
+%files         devel
+%if %{with docs}
+%doc _build/default/_doc/*
+%endif
+%{_libdir}/ocaml/%{srcname}/opam
+%ifarch %{ocaml_native_compiler}
+%{_libdir}/ocaml/%{srcname}/{,*/}*.a
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cmx
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cmxa
+%endif
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cmt
+%{_libdir}/ocaml/%{srcname}/{,*/}*.cmti
+%{_libdir}/ocaml/%{srcname}/{,*/}*.mli
+
+%changelog
+* Wed Dec  1 2021 Jerry James <loganjerry@gmail.com> - 1.3.0-1
+- Initial RPM
diff --git a/sources b/sources
new file mode 100644
index 0000000..ef61710
--- /dev/null
+++ b/sources
@@ -0,0 +1 @@
+SHA512 (mtime-1.3.0.tbz) = 5b998ef803020de4771525adaa448623d348fa079800e72ba2ba78ff2d76a7d89da6200fe8bbc435d1355ad2c571c029398150d618912e58b5765fcf2210a5d0