[Discuss-gnuradio] Help with building a VHF-UHF SDR application on Debian Jessie (using Gnuradio 3.7.10)

[Adrian Musceac]

Hi fellow Debian hams and Gnuradio experts,

I am currently trying to build a SDR experimental application based on Gnuradio for digital voice and data communications in the amateur radio VHF-UHF bands [1][2]. I am using Gnuradio 3.7.10 on Debian GNU/Linux from jessie-backports. I ran into some problems which I will describe below and which may be solved with your kind help.

1. Trying to build gnuradio-qtgui support in, I encountered these errors:
g++ -c -pipe -O2 -D_REENTRANT -Wall -W -DQT_WEBKIT -DQT_NO_DEBUG -DQT_SQL_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I../../qradiolink_mobile -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtSql -I/usr/include/qt4 -I. -I. -I../../qradiolink_mobile -I. -o dtmfcommand.o ../dtmfcommand.cpp
In file included from /usr/include/gnuradio/qtgui/number_sink.h:32:0,
                 from ../gr/gr_demod_bpsk_sdr.h:27,
                 from ../gr/gr_modem.h:38,
                 from ../radioop.h:39,
                 from ../main.cpp:41:
/usr/include/gnuradio/qtgui/qtgui_types.h:26:27: fatal error: qwt_color_map.h: No such file or directory
 #include <qwt_color_map.h>
                           ^
compilation terminated.

It seems as if the relevant header from gnuradio references the wrong path of QWT. I can make it build by editing the headers to provide the QWT directory:
#include <qwt/qwt_color_map.h>
#include <qwt/qwt_scale_draw.h>

It may be that this is relevant only to Debian packages from Jessie-backports, or it may be a larger issue.

2. When trying to build the application using QT 5.3 as provided by Debian, it links fine, but the application segfaults when running. The build works fine with QT 4.8, which makes me think that gnuradio-qtgui in Debian does not support QT5. Would be great to clear this. I can provide backtraces if required.

With thanks for the wonderful packages your communities are providing,

Adrian (YO8RZZ)

[1] https://github.com/kantooon/qradiolink
[2] https://www.youtube.com/watch?v=93nWWASt5a4