fix PYTHONPATH usage

python-sys/python-sys.spec

@@ -127,64 +127,56 @@ PreReq:       OpenPKG, openpkg >= 20160101, python >= %{V_python}
 %build
 
 %install
+    export PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python%{V_python}/site-packages
     ( cd psutil-%{V_psutil}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd setproctitle-%{V_setproctitle}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd cffi-%{V_cffi}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd funcsigs-%{V_funcsigs}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd six-%{V_six}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd shutilwhich-%{V_shutilwhich}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd watchdog-%{V_watchdog}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd pathtools-%{V_pathtools}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \
           --prefix=%{l_prefix}
     ) || exit $?
     ( cd typing-%{V_typing}
-      PYTHONPATH=$RPM_BUILD_ROOT%{l_prefix}/lib/python/site-packages \
       %{l_prefix}/bin/python \
           setup.py install \
           --root=$RPM_BUILD_ROOT \