fix PYTHONPATH usage

python-net/python-net.spec

@@ -227,78 +227,68 @@ PreReq:       python-setup, python-util
 %build
 
 %install
+    export PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python%{V_python}/site-packages
     ( cd py3dns-%{V_py3dns}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd dnspython-%{V_dnspython}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd Twisted-%{V_twisted_major}.%{V_twisted_minor}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd celery-%{V_celery}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd carrot-%{V_carrot}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd ghettoq-%{V_ghettoq}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd IPy-%{V_ipy}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd netaddr-%{V_netaddr}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd autobahn-%{V_autobahn}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd ipaddress-%{V_ipaddress}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd idna-%{V_idna}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
@@ -306,77 +296,66 @@ PreReq:       python-setup, python-util
       chmod a+r $RPM_BUILD_ROOT%{l_prefix}/lib/python*/site-packages/idna*/*
     ) || exit $?
     ( cd wsaccel-%{V_wsaccel}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd treq-%{V_treq}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd txaio-%{V_txaio}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd txtorcon-%{V_txtorcon}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd paramiko-%{V_paramiko}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd priority-%{V_priority}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd hpack-%{V_hpack}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd hyperframe-%{V_hyperframe}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd h2-%{V_h2}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd hyperlink-%{V_hyperlink}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd urllib3-%{V_urllib3}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \