diff --git a/ddccontrol.spec b/ddccontrol.spec
index 0341c7f..4e4823e 100644
--- a/ddccontrol.spec
+++ b/ddccontrol.spec
@@ -1,17 +1,14 @@
-%define db_version 20061014
 Name:          ddccontrol
-Version:       0.4.2
-Release:       3mamba
+Version:       0.5.1
+Release:       1mamba
 Summary:       A program used to control monitor parameters without using the OSD 
 Group:         System/Kernel and Hardware
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://ddccontrol.sourceforge.net/
-Source:        http://dfn.dl.sourceforge.net/sourceforge/ddccontrol/ddccontrol-%{version}.tar.bz2
-Source1:       http://dfn.dl.sourceforge.net/sourceforge/ddccontrol/ddccontrol-db-%{db_version}.tar.bz2
+URL:           https://github.com/ddccontrol/ddccontrol
+Source:        https://github.com/ddccontrol/ddccontrol.git/%{version}/ddccontrol-%{version}.tar.bz2
 License:       GPL
-BuildRoot:     %{_tmppath}/%{name}-%{version}-buildroot
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: libatk-devel
@@ -42,83 +39,117 @@ BuildRequires: libXrender-devel
 BuildRequires: libz-devel
 BuildRequires: udev-devel
 ## AUTOBUILDREQ-END
+Requires:      ddccontrol-db
 Obsoletes:     ddcci-tool
 Provides:      ddcci-tool
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+BuildRoot:     %{_tmppath}/%{name}-%{version}-buildroot
 
 %description
 DDCcontrol is a program running on Linux, used to control monitor parameters, like brightness and contrast, by software, i.e. without using the OSD (On Screen Display) and the buttons in front of the monitor.
 
-%package devel
+%package -n lib%{name}
+Summary:       Shared libraries provided by %{name}
+Group:         System/Libraries
+
+%description -n lib%{name}
+DDCcontrol is a program running on Linux, used to control monitor parameters, like brightness and contrast, by software, i.e. without using the OSD (On Screen Display) and the buttons in front of the monitor.
+This package contains the shared libraries provided with %{name}.
+
+%package -n lib%{name}-devel
 Summary:       Development files for %{name}
 Group:         Development/Libraries
-Requires:      %{name} = %{version}-%{release}
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+Provides:      ddccontrol-devel
+Obsoletes:     ddccontrol-devel < 0.5.1
 
-%description devel
+%description -n lib%{name}-devel
 DDCcontrol is a program running on Linux, used to control monitor parameters, like brightness and contrast, by software, i.e. without using the OSD (On Screen Display) and the buttons in front of the monitor.
 This package contains the headers and static libraries needed for development.
 
 %package gui
 Summary:       GUI for DDCcontrol, a program used to control monitor OSD parameters
 Group:         Graphical Desktop/Applications/Configuration
-Requires:      %{name} = %{version}-%{release}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 
 %description gui
 DDCcontrol is a program running on Linux, used to control monitor parameters, like brightness and contrast, by software, i.e. without using the OSD (On Screen Display) and the buttons in front of the monitor.
 This package contains the graphical user interface.
 
+%debug_package
+
 %prep
-%setup -q -a1
+%setup -q
+autoreconf -f -i
 
 %build
 %configure
 %make
 
-cd ddccontrol-db-%{db_version}
-%configure
-%make
-
 %install
 [ "%{buildroot}" != / ] && rm -rf %{buildroot}
 %makeinstall
 %find_lang %{name}
 
-cd ddccontrol-db-%{db_version}
-%makeinstall
-%find_lang ddccontrol-db
-cat ddccontrol-db.lang >> ../%{name}.lang
-
 %clean
 [ "%{buildroot}" != / ] && rm -rf %{buildroot}
 
+%post
+%systemd_post ddccontrol
+:
+
+%preun
+%systemd_preun ddccontrol
+:
+
+%postun
+%systemd_postun_with_restart ddccontrol
+:
+
+%post -n lib%{name} -p /sbin/ldconfig
+%postun -n lib%{name} -p /sbin/ldconfig
+
 %files -f %{name}.lang
 %defattr(-,root,root)
+%{_sysconfdir}/dbus-1/system.d/ddccontrol.DDCControl.conf
 %{_bindir}/ddccontrol
-%{_bindir}/ddcpci
-%{_libdir}/libddccontrol.so.*
-%dir %{_datadir}/ddccontrol-db
-%{_datadir}/ddccontrol-db/*
-%{_mandir}/man1/ddccontrol.1.gz
-%doc README
-#/usr/sbin/ddcci-tool
+%{_unitdir}/ddccontrol.service
+%{_datadir}/dbus-1/interfaces/ddccontrol.DDCControl.xml
+%{_datadir}/dbus-1/system-services/ddccontrol.DDCControl.service
+%{_mandir}/man1/ddccontrol.1*
 
-%files devel
+%files -n lib%{name}
 %defattr(-,root,root)
+%{_libdir}/libddccontrol_dbus_client.so.*
+%{_libdir}/libddccontrol.so.*
+%{_libexecdir}/ddccontrol/ddccontrol_service
+%{_libexecdir}/ddccontrol/ddcpci
+%doc COPYING
+
+%files -n lib%{name}-devel
+%defattr(-,root,root)
+%dir %{_includedir}/ddccontrol
 %{_includedir}/ddccontrol/*.h
 %{_libdir}/libddccontrol.a
 %{_libdir}/libddccontrol.la
 %{_libdir}/libddccontrol.so
+%{_libdir}/libddccontrol_dbus_client.a
+%{_libdir}/libddccontrol_dbus_client.la
+%{_libdir}/libddccontrol_dbus_client.so
+%{_libdir}/pkgconfig/ddccontrol.pc
 
 %files gui
 %defattr(-,root,root)
 %{_bindir}/gddccontrol
 %{_datadir}/applications/gddccontrol.desktop
-#%{_datadir}/ddccontrol/GNOME_ddcc-applet.xml
-%{_datadir}/pixmaps/gddccontrol.png
-#%{_libdir}/ddccontrol/ddcc-applet
-#%{_libdir}/bonobo/servers/GNOME_ddcc-applet.server
-%{_mandir}/man1/gddccontrol.1.gz
+%{_datadir}/icons/Bluecurve/48x48/apps/gddccontrol.png
+%{_datadir}/icons/hicolor/48x48/apps/gddccontrol.png
+%{_mandir}/man1/gddccontrol.1*
 
 %changelog
+* Sun Feb 07 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 0.5.1-1mamba
+- update to 0.5.1
+
 * Tue Sep 18 2012 Silvan Calarco <silvan.calarco@mambasoft.it> 0.4.2-3mamba
 - rebuilt with(out) gnome 3