Hi Max,
I don't think ignoring the errors is the right solution, as the command sh ./get-festival.sh ends with the following erros:
testinstall.sh: 41: testinstall.sh: ../bin/festival: not found
make[1]: *** [testinstall] Fehler 1
make: *** [test] Fehler 2
./get-festival.sh: 33: ./get-festival.sh: bin/festival: not found
meaning the application festival could not be build. I am not sure if it is needed by QGroundControl, but I assume that it is needed, otherwise there would be no need to have it build according to the documentation.
And Building QGroundControl anyway ends with an error an no application:
/usr/include/osg/Math: In function 'bool osg::isNaN(float)':
../qgroundcontrol/src/QGC.h:55:18: error: 'std::std' has not been declared
#define isnan(x) std::isnan(x)
^
/usr/include/osg/Math: In function 'bool osg::isNaN(double)':
../qgroundcontrol/src/QGC.h:55:18: error: 'std::std' has not been declared
#define isnan(x) std::isnan(x)
make: *** [build-release/obj/MainWindow.o] Error 1
03:33:00: The Process "/usr/bin/make" was ended with the return value 2.
Error while creating/deploying the project qgroundcontrol(Kit: Desktop)
While processing step 'Make'
So, yes I tried that as well and failed as well. The error seems not to be related, but the result still is not what is expected.
I tried apt-get install festival-dev as well, but it did not solve the issue.