diff --git a/dune.spec b/dune.spec
index c732a0c..786d087 100644
--- a/dune.spec
+++ b/dune.spec
@@ -1,20 +1,19 @@
 Name:          dune
 Version:       2.8.1
-Release:       1mamba
+Release:       2mamba
 Summary:       A composable build system for OCaml
 Group:         Development/Tools
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           https://dune.build/
-## GITSOURCE https://github.com/ocaml/dune.git 1.9.2
 Source:        https://github.com/ocaml/dune.git/%{version}/dune-%{version}.tar.bz2
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: ocaml-runtime
 ## AUTOBUILDREQ-END
-BuildRequires: ocaml >= 4.09.0
+BuildRequires: ocaml >= 4.11.1
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
@@ -28,15 +27,15 @@ A composable build system for OCaml.
 
 %build
 ./configure \
-   --libdir=%{_libdir}
-
+   --libdir=%{_libdir}/ocaml \
+   --mandir=%{_mandir} \
+   
 %make release
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 %makeinstall
-
-mv %{buildroot}%{_prefix}/man %{buildroot}%{_datadir}
+ 
 mv %{buildroot}%{_prefix}/doc %{buildroot}%{_datadir}
 
 %clean
@@ -49,14 +48,17 @@ mv %{buildroot}%{_prefix}/doc %{buildroot}%{_datadir}
 #%{_bindir}/ocaml-syntax-shims
 %{_datadir}/emacs/site-lisp/dune-flymake.el
 %{_datadir}/emacs/site-lisp/dune.el
-%dir %{_libdir}/dune
-%{_libdir}/dune/*
+%dir %{_libdir}/ocaml/dune
+%{_libdir}/ocaml/dune/*
 %dir %{_docdir}/dune
 %{_docdir}/dune/*
 %{_mandir}/man1/dune*.1*
 %{_mandir}/man5/dune-config.5*
 
 %changelog
+* Sat Jan 23 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.8.1-2mamba
+- fix ocaml libdir
+
 * Mon Jan 18 2021 Automatic Build System <autodist@mambasoft.it> 2.8.1-1mamba
 - automatic version update by autodist