Fingers crossed.

python-qt5.spec

@@ -329,6 +329,11 @@ cp -alf %{buildroot}%{py3_sipdir} \
         %{buildroot}%{_datadir}/python3-sip/PyQt5
 %endif
 
+if [ "%{_prefix}" != "/usr" ]; then
+  cp -ru %{buildroot}/usr/* %{buildroot}%{_prefix}/
+  rm -rf %{buildroot}/usr/*
+fi
+
 # ensure .so modules are executable for proper -debuginfo extraction
 for i in %{buildroot}%{python3_sitearch}/PyQt5/*.so %{buildroot}%{python3_dbus_dir}/pyqt5.so ; do
 test -x $i  || chmod a+rx $i