diff --git a/.gitignore b/.gitignore
index cd66ac9..f9d81e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 /v1.6.4.tar.gz
 /v1.6.5.tar.gz
 /v1.6.6.tar.gz
+/cppo-1.6.8.tar.gz
diff --git a/ocaml-cppo.spec b/ocaml-cppo.spec
index bb74657..58fbd10 100644
--- a/ocaml-cppo.spec
+++ b/ocaml-cppo.spec
@@ -1,27 +1,22 @@
-%global opt %(test -x %{_bindir}/ocamlopt && echo 1 || echo 0)
-%if !%{opt}
+%ifnarch %{ocaml_native_compiler}
 %global debug_package %{nil}
 %endif
 
+%define libname cppo
+
 Name:           ocaml-cppo
-Version:        1.6.6
-Release:        14%{?dist}
+Version:        1.6.8
+Release:        1%{?dist}
 Summary:        Equivalent of the C preprocessor for OCaml programs
 
 License:        BSD
-URL:            http://mjambon.com/cppo.html
-Source0:        https://github.com/ocaml-community/cppo/archive/v%{version}.tar.gz
+URL:            https://ocaml-community.github.io/cppo/
+Source0:        https://github.com/ocaml-community/cppo/archive/v%{version}/%{libname}-%{version}.tar.gz
 
-BuildRequires: make
-BuildRequires:  ocaml >= 3.10.0
-BuildRequires:  ocaml-findlib
-%if !%{opt}
-Requires:       ocaml >= 3.10.0
-%endif
-BuildRequires:  ocaml-ocamlbuild-devel
+BuildRequires:  ocaml >= 4.02.3
 BuildRequires:  ocaml-dune
-
-%define libname %(sed -e 's/^ocaml-//' <<< %{name})
+BuildRequires:  ocaml-findlib
+BuildRequires:  ocaml-ocamlbuild-devel
 
 %description
 Cppo is an equivalent of the C preprocessor targeted at the OCaml
@@ -38,37 +33,59 @@ on the standard parsing tools Ocamllex and Ocamlyacc, which contribute
 to the robustness of cppo across OCaml versions.
 
 
+%package ocamlbuild
+Summary:        Preprocessing plugin for ocamlbuild
+Requires:       %{name}%{?_isa} = %{version}-%{release}
+Requires:       ocaml-ocamlbuild%{?_isa}
+# There is no devel subpackage because this package IS for development purposes
+
+
+%description ocamlbuild
+This package contains a plugin for ocamlbuild that enables calling cppo
+at build time.  To use it, call ocamlbuild with the argument
+`-plugin-tag package(cppo_ocamlbuild)`.
+
+
 %prep
-%setup -q -n %{libname}-%{version}
-sed -i.add-debuginfo \
-    's/ocamlopt/ocamlopt -g/;s/ocamlc \(-[co]\)/ocamlc -g \1/' \
-    Makefile
+%autosetup -n %{libname}-%{version}
 
 
 %build
-make %{?_smp_mflags} all
+dune build %{?_smp_mflags} --verbose --profile release
 
 
 %install
-%{__install} -d $RPM_BUILD_ROOT%{_bindir}
-%{__install} -p _build/install/default/bin/cppo $RPM_BUILD_ROOT%{_bindir}/
+dune install --destdir=%{buildroot}
+
+# We do not want the ml files
+find %{buildroot}%{_libdir}/ocaml -name \*.ml -delete
+
+# We install the documentation with the doc macro
+rm -fr %{buildroot}%{_prefix}/doc
 
 
 %check
-%ifnarch %{arm} %{power64}
-# Fails on armv7hl and ppc64le with:
-# Error: math error
-make test
-%endif
+dune runtest --profile release
 
 
 %files
 %license LICENSE.md
 %doc Changes README.md
 %{_bindir}/cppo
+%{_libdir}/ocaml/cppo
+
+
+%files ocamlbuild
+%{_libdir}/ocaml/cppo_ocamlbuild/
 
 
 %changelog
+* Tue Dec 14 2021 Jerry James <loganjerry@gmail.com> - 1.6.8-1
+- Version 1.6.8
+- New URLs
+- Add ocamlbuild subpackage for the plugin
+- Build, install, and test with dune
+
 * Mon Oct 04 2021 Richard W.M. Jones <rjones@redhat.com> - 1.6.6-14
 - OCaml 4.13.1 build
 
diff --git a/sources b/sources
index efd6b16..6e98a3e 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (v1.6.6.tar.gz) = 80b0d7a5f0f5b7d9d62ddfb204ebf5e3216c2926ba7f667b9ef10981de6a51cd6d670b7062769bf6fbdd163c1c8fb5426a74c31234ddc03ec94a75645bf469da
+SHA512 (cppo-1.6.8.tar.gz) = 069bbe0ef09c03b0dc4b5795f909c3ef872fe99c6f1e6704a0fa97594b1570b3579226ec67fe11d696ccc349a4585055bbaf07c65eff423aa45af28abf38c858