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[Discuss-gnuradio] QTGUI Issue

From: Richard Bell
Subject: [Discuss-gnuradio] QTGUI Issue
Date: Mon, 26 Jan 2015 10:59:07 -0800

Problem: I can't use qtgui blocks. Wxgui blocks work. My system is CentOS 6.6 running gnuradio 3.7.6 installed using pybombs.

Debug: I've run cmake in pybombs/gnuradio/src/build to make sure qtgui was enabled during install, and it is. The only gnuradio components disabled that are listed by cmake are doxygen, sphinx, gr-comedi and gr-zeromq.

I then opened a terminal to test library imports. I can 'import gnuradio' and I can 'from gnuradio import wxgui', as you would expect. When I try, 'from gnuradio import qtgui', I get the following output:

>>> import gnuradio
>>> from gnuradio import wxgui
>>> from gnuradio import qtgui
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/tsvcis/Documents/target/lib64/python2.6/site-packages/gnuradio/qtgui/__init__.py", line 34, in <module>
    from qtgui_swig import *
  File "/home/tsvcis/Documents/target/lib64/python2.6/site-packages/gnuradio/qtgui/qtgui_swig.py", line 26, in <module>
    _qtgui_swig = swig_import_helper()
  File "/home/tsvcis/Documents/target/lib64/python2.6/site-packages/gnuradio/qtgui/qtgui_swig.py", line 22, in swig_import_helper
    _mod = imp.load_module('_qtgui_swig', fp, pathname, description)
ImportError: /home/tsvcis/Documents/target/lib64/libgnuradio-qtgui-3.7.7git.so.0.0.0: undefined symbol: _ZN7QwtPlot16staticMetaObjectE

Conclusion: There is a problem with my qtgui install but I don't know how to debug any further to apply a fix. I've googled the traceback output with no luck. I'm hoping someone has come across and fixed this issue before who could explain what's going on.


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