diff --git a/ocaml-cppo.spec b/ocaml-cppo.spec
index 757543a..2da5a72 100644
--- a/ocaml-cppo.spec
+++ b/ocaml-cppo.spec
@@ -1,6 +1,6 @@
 Name:          ocaml-cppo
 Version:       1.6.9
-Release:       1mamba
+Release:       3mamba
 Summary:       C-style preprocessor for OCaml
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
@@ -12,9 +12,11 @@ License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: ocaml
+BuildRequires: ocaml-runtime
 BuildRequires: ocamlbuild
 ## AUTOBUILDREQ-END
-BuildRequires: ocamlbuild  >= 0.14.1
+BuildRequires: ocamlbuild >= 0.14.2-2mamba
+BuildRequires: ocaml >= 4.14.1
 BuildRequires: dune
 
 %description
@@ -26,13 +28,13 @@ C-style preprocessor for OCaml.
 %setup -q -n cppo-%{version}
 
 %build
-%make all
+dune build
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-%makeinstall
+DESTDIR=%{buildroot} dune install --prefix "%{_prefix}" --libdir "%{_libdir}/ocaml"
 
-rm -rf %{buildroot}%{_prefix}/doc
+rm -rf %{buildroot}/usr/doc
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
@@ -47,6 +49,12 @@ rm -rf %{buildroot}%{_prefix}/doc
 %doc README.md
 
 %changelog
+* Sun Jul 16 2023 Sdk Build System <sdk@mambasoft.it> 1.6.9-3mamba
+- rebuilt with ocamlbuild 0.14.2
+
+* Thu Jul 06 2023 Sdk Build System <sdk@mambasoft.it> 1.6.9-2mamba
+- rebuilt with ocaml 4.14.1
+
 * Tue May 31 2022 Automatic Build System <autodist@mambasoft.it> 1.6.9-1mamba
 - automatic version update by autodist