- gnuradio-companion needs to be invoked with root privilege
  if you add several input devices, say, to activate following parts 
         Sources -> RTL-SDR Source
                    osmoscom Source
  etc. One way to to this is (as my example)
  X11 -> xterm -> sudo -s 
      -> export XAUTHORITY=/home/my_login/.Xauthority
      -> gnuradio-companion
  (Thanks rkujawa@ for this)
  
- OPTIONS.gnuradio= ninja doesn't package with error:
  # Adding ninja to following line (now) stops
  # [164/850] cd /PATH/wip/gnuradio-core/work/gnuradio-3.7.5/build/gr-audio/swig && ""
  # FAILED: cd /PATH/wip/gnuradio-core/work/gnuradio-3.7.5/build/gr-audio/swig && ""
  # : permission denied
  (updating cmake 3.0.2 in wip doesn't help)

****************************************************************
  generationg replace.mk
****************************************************************
 
  754  2019-09-16 23:08  grep INFO /tmp/log | awk '{print $6}' |sed -e 's/py.$/py/' |sort > nega
  755  2019-09-16 23:08  (cd  /tmp/wip/gnuradio-core/work/gnuradio-3.8.0.0; find .  -name \*py ) | sed 's|./||' |sort > posi
 
  775  2019-09-16 23:13  diff -u  posi nega |grep '^\-' | sed -e "s/-/    /" -e 's/$/  \\/' >!  replace-python.mk



****************************************************************
  recent make problem
****************************************************************
-- Checking for module SWIG
-- Found SWIG version 2.0.12.
-- 
-- Configuring python-support support...
--   Dependency PYTHONLIBS_FOUND = TRUE
--   Dependency SWIG_FOUND = TRUE
--   Dependency SWIG_VERSION_CHECK = FALSE
--   Dependency SIX_FOUND = TRUE
CMake Error at cmake/Modules/GrComponent.cmake:75 (message):
  user force-enabled python-support but configuration checked failed
Call Stack (most recent call first):
  CMakeLists.txt:373 (GR_REGISTER_COMPONENT)


-- Configuring incomplete, errors occurred!
See also "/tmp/wip/gnuradio-core/work/gnuradio-3.8.0.0/build/CMakeFiles/CMakeOutput.log".
See also "/tmp/wip/gnuradio-core/work/gnuradio-3.8.0.0/build/CMakeFiles/CMakeError.log".
*** Error code 1

