diff --git a/nautilus-python.spec b/nautilus-python.spec
index 184f0ad..4e54629 100644
--- a/nautilus-python.spec
+++ b/nautilus-python.spec
@@ -13,16 +13,19 @@
 
 Name:           nautilus-python
 Version:        1.2.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Python bindings for Nautilus
 
-Group:          Development/Libraries
 License:        GPLv2+
 URL:            http://www.gnome.org/
 Source0:        http://ftp.gnome.org/pub/GNOME/sources/%{name}/%(v=%{version}; echo ${v:0:3}; )/%{name}-%{version}.tar.xz
 
+%if %{with python2}
 BuildRequires:  python2-devel
+%endif
+%if %{with python3}
 BuildRequires:  python3-devel
+%endif
 BuildRequires:  nautilus-devel
 BuildRequires:  pygobject3-devel
 BuildRequires:  gtk-doc
@@ -41,9 +44,9 @@ Summary:        %summary
 Requires:       nautilus >= 3.0
 %{?python_provide:%python_provide python2-nautilus}
 # Remove before F30
-Provides: nautilus-python = %{version}-%{release}
-Provides: nautilus-python%{?_isa} = %{version}-%{release}
-Obsoletes: nautilus-python < %{version}-%{release}
+Provides: %{name} = %{version}-%{release}
+Provides: %{name}%{?_isa} = %{version}-%{release}
+Obsoletes: %{name} < %{version}-%{release}
 
 %description -n python2-nautilus
 %_description
@@ -103,11 +106,25 @@ popd
 
 
 %install
-%if %{with python2}
-%make_install DESTDIR=$RPM_BUILD_ROOT
-%endif
+# need to install build with python3 first because it could overwrite default build
 %if %{with python3}
 %make_install DESTDIR=$RPM_BUILD_ROOT -C python3
+mv $RPM_BUILD_ROOT%{_libdir}/nautilus/extensions-3.0/lib%{name}.so \
+ $RPM_BUILD_ROOT%{_libdir}/nautilus/extensions-3.0/lib%{name}3.so
+# install symlink for backwards compatibility
+%if 0
+# TODO enable symlink when nautilus ported to support python3 ´
+ln -fs lib%{name}3.so \
+ $RPM_BUILD_ROOT%{_libdir}/nautilus/extensions-3.0/lib%{name}.so
+%endif
+%endif
+%if %{with python2}
+%make_install DESTDIR=$RPM_BUILD_ROOT
+mv $RPM_BUILD_ROOT%{_libdir}/nautilus/extensions-3.0/lib%{name}.so \
+ $RPM_BUILD_ROOT%{_libdir}/nautilus/extensions-3.0/lib%{name}2.so
+# install symlink for backwards compatibility
+ln -fs lib%{name}2.so \
+ $RPM_BUILD_ROOT%{_libdir}/nautilus/extensions-3.0/lib%{name}.so
 %endif
 mkdir -p $RPM_BUILD_ROOT%{_datadir}/%{name}/extensions
 find $RPM_BUILD_ROOT -name '*.la' -delete
@@ -116,20 +133,20 @@ rm -rfv $RPM_BUILD_ROOT%{_docdir}
 
 %check
 %if %{with test_examples}
-install -m0755 -d ~/.local/share/nautilus-python/extensions
+install -m0755 -d ~/.local/share/%{name}/extensions
 %if %{with python2}
-install -m0644 -p -t ~/.local/share/nautilus-python/extensions python3/examples/*.py*
+install -m0644 -p -t ~/.local/share/%{name}/extensions examples/*.py*
 export TMPDIR=$(pwd)/examples
 # FIXME dbus service, rhbz#1623781
 xvfb-run -a -d dbus-launch --exit-with-x11 nautilus -c
-rm -v ~/.local/share/nautilus-python/extensions/*.py*
+rm -v ~/.local/share/%{name}/extensions/*.py*
 %endif
 %if %{with python3}
-install -m0644 -p -t ~/.local/share/nautilus-python/extensions python3/examples/*.py*
+install -m0644 -p -t ~/.local/share/%{name}/extensions python3/examples/*.py*
 export TMPDIR=$(pwd)/python3/examples
 # TODO does nautilus work with python3?
 #xvfb-run -a -d dbus-launch --exit-with-x11 nautilus -c
-rm -v ~/.local/share/nautilus-python/extensions/*.py*
+rm -v ~/.local/share/%{name}/extensions/*.py*
 %endif
 %endif
 
@@ -138,7 +155,8 @@ rm -v ~/.local/share/nautilus-python/extensions/*.py*
 %files -n python2-nautilus
 %license COPYING
 %doc README AUTHORS NEWS
-%{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}.so
+%{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}*.so
+%exclude %{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}3.so
 %dir %{_datadir}/%{name}/extensions
 
 %files -n python2-nautilus-devel
@@ -151,7 +169,9 @@ rm -v ~/.local/share/nautilus-python/extensions/*.py*
 %files -n python3-nautilus
 %license COPYING
 %doc README AUTHORS NEWS
-%{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}.so
+%{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}3.so
+%exclude %{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}2.so
+%exclude %{_libdir}/nautilus/extensions-%{NAUTILUS_MAYOR_VER}/lib%{name}.so
 %dir %{_datadir}/%{name}/extensions
 
 %files -n python3-nautilus-devel
@@ -162,6 +182,11 @@ rm -v ~/.local/share/nautilus-python/extensions/*.py*
 
 
 %changelog
+* Tue Oct 30 2018 Raphael Groner <projects.rg@smart.ms> - 1.2.1-4
+- separate properly builds of python2 and python3, rhbz#1636626
+- drop obsolete Group tag
+- use name macro
+
 * Wed Sep 12 2018 Raphael Groner <projects.rg@smart.ms> - 1.2.1-3
 - use just python3 prefix for subpackage name
 - because unknown how to procee with epel branches