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+%global libname dune
+
+# Since menhir now requires dune to build, but dune needs menhir only for the
+# tests, build in bootstrap mode to skip the tests and the need for menhir.
+%bcond_with bootstrap
+
+Name:           ocaml-%{libname}
+Version:        2.4.0
+Release:        1%{?dist}
+Summary:        A composable build system for OCaml
+
+# Dune itself is MIT.  Some bundled libraries have a different license:
+# ISC:
+# - vendor/cmdliner
+# LGPLv2:
+# - vendor/incremental-cycles
+# LGPLv2 with exceptions:
+# - vendor/opam-file-format
+# - vendor/re
+License:        MIT and LGPLv2 and LGPLv2 with exceptions and ISC
+
+URL:            https://dune.build
+Source0:        https://github.com/ocaml/%{libname}/archive/%{version}/%{libname}-%{version}.tar.gz
+
+BuildRequires:  emacs
+BuildRequires:  ocaml >= 4.07
+BuildRequires:  ocaml-findlib
+BuildRequires:  python3dist(sphinx)
+BuildRequires:  python3dist(sphinx-rtd-theme)
+
+%if %{without bootstrap}
+# Required by tests.
+#BuildRequires:  ocaml-menhir
+%endif
+
+# Dune has vendored deps (ugh):
+# I'm not clear on how to unbundle them.
+# It seems to be unsupported upstream; the bootstrap process for dune
+# doesn't seem to be able to detect libraries installed systemwide.
+# https://github.com/ocaml/dune/issues/220
+Provides:      bundled(ocaml-opam-file-format) = 2.0.0
+Provides:      bundled(ocaml-cmdliner) = 1.0.3
+Provides:      bundled(ocaml-re) = 1.7.1
+
+Provides:      dune = %{version}-%{release}
+
+Provides:      jbuilder = %{version}-%{release}
+Obsoletes:     jbuilder < 1.0.1-3
+
+%description
+Dune is a build system designed for OCaml/Reason projects only. It focuses
+on providing the user with a consistent experience and takes care of most of
+the low-level details of OCaml compilation. All you have to do is provide a
+description of your project and Dune will do the rest.
+
+The scheme it implements is inspired from the one used inside Jane Street and
+adapted to the open source world. It has matured over a long time and is used
+daily by hundred of developers, which means that it is highly tested and
+productive.
+
+%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}.
+
+%package        doc
+Summary:        HTML documentation for %{name}
+Requires:       %{name} = %{version}-%{release}
+
+BuildArch:      noarch
+
+%description    doc
+HTML documentation for dune, a composable build system for OCaml.
+
+%package        emacs
+Summary:        Emacs support for %{name}
+License:        ISC
+Requires:       %{name} = %{version}-%{release}
+
+BuildArch:      noarch
+
+%description    emacs
+The %{name}-devel package contains Emacs integration with the dune build
+system, a mode to edit dune files, and flymake support for dune files.
+
+%prep
+%autosetup -n %{libname}-%{version} -p1
+
+%build
+./configure --libdir %{_libdir}/ocaml --mandir %{_mandir}
+
+# This command fails, because ppx_bench, ppx_expect, and core_bench are missing.
+# However, it is only tests that fail, not the actual build, so ignore the
+# failures and continue.
+%make_build release || :
+./dune.exe build @install
+%make_build doc
+
+# Relink the stublib.  See https://github.com/ocaml/dune/issues/2977.
+cd _build/default/src/stdune
+ocamlmklib -g -ldopt "$RPM_LD_FLAGS" -o stdune_stubs fcntl_stubs.o
+cd -
+
+%install
+# "make install" only installs the binary.  We want the libraries, too.
+./dune.exe install --destdir %{buildroot}
+
+%ifarch %{ocaml_native_compiler}
+# Add missing executable bits
+find %{buildroot}%{_libdir}/ocaml -name \*.cmxs -exec chmod 0755 {} \+
+%endif
+
+# Byte compile the Emacs files
+cd %{buildroot}%{_emacs_sitelispdir}
+%_emacs_bytecompile dune.el dune-flymake.el
+cd -
+
+# Install documentation by way of pkgdocdir.
+rm -fr %{buildroot}%{_prefix}/doc
+mkdir -p %{buildroot}%{_pkgdocdir}/
+cp -ar README.md CHANGES.md MIGRATION.md doc/_build/* %{buildroot}%{_pkgdocdir}/
+
+%if %{without bootstrap}
+%check
+# These are the only tests we can run.  The others require components that
+# either depend on dune themselves or are not available in Fedora at all.
+%{buildroot}%{_bindir}/dune runtest test/unit-tests
+%endif
+
+%files
+%license LICENSE.md
+%doc %{_pkgdocdir}/README.md
+%doc %{_pkgdocdir}/CHANGES.md
+%doc %{_pkgdocdir}/MIGRATION.md
+%{_bindir}/dune
+%{_mandir}/man*/dune*
+%dir %{_pkgdocdir}/
+%dir %{_libdir}/ocaml/dune/
+%dir %{_libdir}/ocaml/dune-action-plugin/
+%dir %{_libdir}/ocaml/dune-build-info/
+%dir %{_libdir}/ocaml/dune-configurator/
+%dir %{_libdir}/ocaml/dune-glob/
+%dir %{_libdir}/ocaml/dune-private-libs/
+%dir %{_libdir}/ocaml/dune-private-libs/dune-lang/
+%dir %{_libdir}/ocaml/dune-private-libs/dune_re/
+%dir %{_libdir}/ocaml/dune-private-libs/ocaml-config/
+%dir %{_libdir}/ocaml/dune-private-libs/stdune/
+%{_libdir}/ocaml/dune*/META
+%{_libdir}/ocaml/dune*/*.cma
+%{_libdir}/ocaml/dune*/*.cmi
+%{_libdir}/ocaml/dune-private-libs/*/*.cma
+%{_libdir}/ocaml/dune-private-libs/*/*.cmi
+%ifarch %{ocaml_native_compiler}
+%{_libdir}/ocaml/dune*/*.cmxs
+%{_libdir}/ocaml/dune-private-libs/*/*.cmxs
+%{_libdir}/ocaml/stublibs/dllstdune_stubs.so
+%endif
+
+%files devel
+%{_libdir}/ocaml/dune*/dune-package
+%{_libdir}/ocaml/dune*/opam
+%{_libdir}/ocaml/dune*/*.cmt
+%{_libdir}/ocaml/dune*/*.cmti
+%{_libdir}/ocaml/dune*/*.ml
+%{_libdir}/ocaml/dune*/*.mli
+%{_libdir}/ocaml/dune-private-libs/*/*.cmt
+%{_libdir}/ocaml/dune-private-libs/*/*.cmti
+%{_libdir}/ocaml/dune-private-libs/*/*.ml
+%{_libdir}/ocaml/dune-private-libs/*/*.mli
+%ifarch %{ocaml_native_compiler}
+%{_libdir}/ocaml/dune*/*.a
+%{_libdir}/ocaml/dune*/*.cmx
+%{_libdir}/ocaml/dune*/*.cmxa
+%{_libdir}/ocaml/dune-private-libs/*/*.a
+%{_libdir}/ocaml/dune-private-libs/*/*.cmx
+%{_libdir}/ocaml/dune-private-libs/*/*.cmxa
+%endif
+
+%files doc
+%exclude %{_pkgdocdir}/README.md
+%exclude %{_pkgdocdir}/CHANGES.md
+%doc %{_pkgdocdir}/*
+
+%files emacs
+%{_emacs_sitelispdir}/dune*
+
+%changelog
+* Thu Nov 12 2020 wanghongzhe<wanghongzhe@huawei.com> - 2.4.0-1
+- Package Init