diff --git a/README.md b/README.md
index b519f5e..2226b2d 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # libnettle7
 
+Nettle is a cryptographic library that is designed to fit easily in more or less any context: In crypto toolkits for object-oriented languages (C++, Python, Pike, ...), in applications like LSH or GNUPG, or even in kernel space.
+
diff --git a/libnettle7.spec b/libnettle7.spec
new file mode 100644
index 0000000..ce8b918
--- /dev/null
+++ b/libnettle7.spec
@@ -0,0 +1,138 @@
+Name:          libnettle7
+Version:       3.5.1
+Release:       3mamba
+Summary:       A cryptographic library that is designed to fit easily in more or less any context
+Group:         System/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           http://www.lysator.liu.se/~nisse/nettle/
+Source:        http://www.lysator.liu.se/~nisse/archive/nettle-%{version}.tar.gz
+License:       LGPL, GPL
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: libgmp-devel
+BuildRequires: pkg-config
+## AUTOBUILDREQ-END
+Requires(post): %{__install_info}
+BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+
+%description
+Nettle is a cryptographic library that is designed to fit easily in more or less any context: In crypto toolkits for object-oriented languages (C++, Python, Pike, ...), in applications like LSH or GNUPG, or even in kernel space.
+
+%package devel
+Group:         Development/Libraries
+Summary:       Static libraries and headers for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%description devel
+Nettle is a cryptographic library that is designed to fit easily in more or less any context: In crypto toolkits for object-oriented languages (C++, Python, Pike, ...), in applications like LSH or GNUPG, or even in kernel space.
+
+This package contains static libraries and header files need for development.
+
+%package tools
+Group:         Applications/Security
+Summary:       Utility applications for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%description tools
+This package contains utility applications for %{name}.
+
+%debug_package
+
+%prep
+%setup -q -n nettle-%{version}
+
+%build
+%configure --enable-shared
+%make
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+%makeinstall
+
+chmod +x %{buildroot}%{_libdir}/lib*.so.*
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%post -p /sbin/ldconfig
+%postun -p /sbin/ldconfig
+
+%post devel
+%install_info nettle.info
+exit 0
+
+%preun devel
+%uninstall_info nettle.info
+exit 0
+
+%files
+%defattr(-,root,root)
+%{_libdir}/libhogweed.so.*
+%{_libdir}/libnettle.so.*
+%doc AUTHORS COPYINGv2 COPYINGv3 COPYING.LESSERv3
+
+%files devel
+%defattr(-,root,root)
+%dir %{_includedir}/nettle
+%{_includedir}/nettle/*
+%{_libdir}/libhogweed.a
+%{_libdir}/libnettle.a
+%{_libdir}/libhogweed.so
+%{_libdir}/libnettle.so
+%{_infodir}/nettle.info.*
+%{_libdir}/pkgconfig/hogweed.pc
+%{_libdir}/pkgconfig/nettle.pc
+%doc ChangeLog NEWS README
+
+%files tools
+%defattr(-,root,root)
+%{_bindir}/nettle-hash
+%{_bindir}/nettle-lfib-stream
+%{_bindir}/nettle-pbkdf2
+%{_bindir}/pkcs1-conv
+%{_bindir}/sexp-conv
+
+%changelog
+* Tue May 12 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 3.5.1-3mamba
+- legacy package
+
+* Tue Jul 23 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 3.5.1-2mamba
+- fix installed library permissions so that also auto provides are fixed
+
+* Sun Jul 21 2019 Automatic Build System <autodist@mambasoft.it> 3.5.1-1mamba
+- automatic version update by autodist
+
+* Tue Dec 11 2018 Automatic Build System <autodist@mambasoft.it> 3.4.1-1mamba
+- automatic version update by autodist
+
+* Sun Feb 04 2018 Automatic Build System <autodist@mambasoft.it> 3.4-1mamba
+- automatic version update by autodist
+
+* Wed Oct 05 2016 Automatic Build System <autodist@mambasoft.it> 3.3-1mamba
+- automatic version update by autodist
+
+* Mon Feb 01 2016 Automatic Build System <autodist@mambasoft.it> 3.2-1mamba
+- automatic version update by autodist
+
+* Wed May 06 2015 Automatic Build System <autodist@mambasoft.it> 3.1.1-1mamba
+- automatic update by autodist
+
+* Wed Jul 02 2014 Automatic Build System <autodist@mambasoft.it> 3.0-1mamba
+- automatic update by autodist
+
+* Thu May 30 2013 Automatic Build System <autodist@mambasoft.it> 2.7.1-1mamba
+- automatic version update by autodist
+
+* Fri Apr 26 2013 Automatic Build System <autodist@mambasoft.it> 2.7-1mamba
+- automatic version update by autodist
+
+* Sun Jan 20 2013 Automatic Build System <autodist@mambasoft.it> 2.6-1mamba
+- automatic version update by autodist
+
+* Thu Jul 19 2012 Silvan Calarco <silvan.calarco@mambasoft.it> 2.5-1mamba
+- update to 2.5
+
+* Sun Jul 24 2011 Silvan Calarco <silvan.calarco@mambasoft.it> 2.2-1mamba
+- package created by autospec