diff --git a/PyQt4.spec b/PyQt4.spec
index dd5dc0f..da2d82d 100644
--- a/PyQt4.spec
+++ b/PyQt4.spec
@@ -2,13 +2,13 @@
 
 Name:          PyQt4
 Version:       4.12.3
-Release:       4mamba
+Release:       5mamba
 Summary:       Python bindings for the Qt cross platform GUI toolkit
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://www.riverbankcomputing.com/software/pyqt
+URL:           https://www.riverbankcomputing.com/software/pyqt
 Source:        https://sourceforge.net/projects/pyqt/files/PyQt4/PyQt-%{version}/PyQt4_gpl_x11-%{version}.tar.gz
 Patch0:        %{name}-egl.patch
 Patch1:        %{name}-4.7.3-qreal_float_support.patch
@@ -23,75 +23,55 @@ BuildRequires: libX11-devel
 BuildRequires: libXext-devel
 BuildRequires: libdbus-devel
 BuildRequires: libgcc
-BuildRequires: libphonon-devel
-BuildRequires: libpython-devel
+BuildRequires: libphonon4-devel
+BuildRequires: libpython3-devel
 BuildRequires: libqt4-devel
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
 BuildRequires: libpython3-devel >= 3.7.4
+BuildRequires: sip4
 BuildRequires: chrpath
 BuildRequires: libXcursor-devel
 BuildRequires: python-dbus-py3
 BuildRequires: python-dbus-devel
-# WARNING: do not parametrize python-sip-devel version or it will be useless for ports
-%ifnarch aarch64
-BuildRequires: python-sip4 >= 4.19.22
-BuildRequires: python-sip4-py36 >= 4.19.22
-%endif
 BuildRequires: python-sip4-py3 >= 4.19.22
-#Requires:      python-sip4 = %{pythonsip_ver}
-Requires:      python-dbus
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 PyQt4 is a comprehensive set of Python bindings for Qt4 cross platform GUI toolkit.
 
-%if "%?with_pyver"
-%define pyver           %{with_pyver}
-%define __python        %(rpm --eval %{__python%{with_pyver}})
-%define python_sitearch %(rpm --eval %{python%{with_pyver}_sitearch})
-%define python_sitelib  %(rpm --eval %{python%{with_pyver}_sitelib})
-%define python_inc      %(rpm --eval %{python%{with_pyver}_inc})
-%define python_version  %(rpm --eval %{python%{with_pyver}_version})
-%define python_provides %(rpm --eval %{python%{with_pyver}_provides})
-%define python_requires %(rpm --eval %{python%{with_pyver}_requires})
-%define py_requires     %(rpm --eval %{py%{with_pyver}_requires})
-
-%package py%{pyver}
-Group:         System/Libraries/Python
-Summary:       Python %{pyver} bindings for the Qt cross platform GUI toolkit
-#Requires:      python-sip4%{?with_pyver:-py%{pyver}} = %{pythonsip_ver}
-Requires:      python-dbus%{?with_pyver:-py%{pyver}}
-%py_requires
-
-%description py%{pyver}
-PyQt4 is a comprehensive set of Python bindings for Qt4 cross platform GUI toolkit.
-%endif
-
 %package devel
 Summary:       Development files for PyQt4
 Group:         Development/Libraries
-Requires:      %{name}%{?with_pyver:-py%{pyver}} = %{?epoch:%epoch:}%{version}-%{release}
-Requires:      %{name}%{?with_pyver:-py%{pyver}}-QtDesigner = %{?epoch:%epoch:}%{version}-%{release}
+Requires:      %{name}-py3 = %{?epoch:%epoch:}%{version}-%{release}
 
 %description devel
 PyQt4 is a comprehensive set of Python bindings for Nokia's Qt4 cross platform GUI toolkit.
 This package contains files needed for development.
 
+%if 0%{?with_pyver}
+%define py_requires_append \
+Requires:     python-dbus%{?with_pyver:-py%{pyver}} \
+Provides:     PyQt4 \
+Obsoletes:    PyQt4 <= 4.12.3-4mamba
+Obsoletes:    PyQt4-py36 <= 4.12.3-4mamba
+%pyver_package
+%endif
+
 %package %{?with_pyver:py%{pyver}-}QtDesigner
 Summary:       QtDesigner support components for PyQt4
 Group:         System/Libraries
 Requires:      %{name}%{?with_pyver:-py%{pyver}} = %{?epoch:%epoch:}%{version}-%{release}
+Obsoletes:     PyQt4-QtDesigner <= 4.12.3-4mamba
+Obsoletes:     PyQt4-py36-QtDesigner <= 4.12.3-4mamba
 
 %description %{?with_pyver:py%{pyver}-}QtDesigner
 PyQt4 is a comprehensive set of Python bindings for Nokia's Qt4 cross platform GUI toolkit.
 This package contains the QtDesigner support components for PyQt4.
 
 %prep
-%setup -q -n PyQt4_gpl_x11-%{version} -D -T
+%setup -q -n PyQt4_gpl_x11-%{version}
 
 %build
-:<< _EOF
 sed -i "/generate_code(\"phonon\")/s:phonon\":&, extra_include_dirs=[\"%{_includedir}/phonon\"]:" configure.py
 
 %{__python} configure.py CXXFLAGS="%{optflags}" CFLAGS="%{optflags}" \
@@ -125,7 +105,8 @@ find examples/ -type f -exec chmod 0644 {} ';'
 
 %files %{?with_pyver:py%{pyver}}
 %defattr(-,root,root)
-%{python_sitelib}/dbus/mainloop/qt.so
+%{python_sitearch}/dbus/mainloop/qt.so
+%dir %{python_sitearch}/PyQt4
 %{python_sitearch}/PyQt4/Qt.so
 %{python_sitearch}/PyQt4/QtAssistant.so
 %{python_sitearch}/PyQt4/QtCore.so
@@ -144,8 +125,8 @@ find examples/ -type f -exec chmod 0644 {} ';'
 %{python_sitearch}/PyQt4/QtXml.so
 %{python_sitearch}/PyQt4/QtXmlPatterns.so
 %{python_sitearch}/PyQt4/__init__.py
-%ifnarch aarch64
 %{python_sitearch}/PyQt4/phonon.so
+%ifnarch aarch64
 %{python_sitearch}/PyQt4/QtWebKit.so
 %endif
 %{python_sitearch}/PyQt4/pyqtconfig.py
@@ -171,6 +152,10 @@ find examples/ -type f -exec chmod 0644 {} ';'
 %{_qt4_plugindir}/designer/*
 
 %changelog
+* Sat Mar 27 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 4.12.3-5mamba
+- x86_64, aarch64: install dbus/mainloop/qt.so under %python_sitearch
+- build only py3 version with obsoletes
+
 * Fri Apr 10 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 4.12.3-4mamba
 - rebuilt with python-sip4