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build fails with an error: [ 48%] Building CXX object CMakeFiles/qastrocam-g2.dir/src/QCamSelection.cpp.o /home/qwerty/building/qastrocam-g2-svn/src/qastrocam-g2/src/QCamMovieAvi_libav.cpp: In member function ‘virtual bool QCamMovieAvi::openImpl(const std::string&, const QCam&)’: /home/qwerty/building/qastrocam-g2-svn/src/qastrocam-g2/src/QCamMovieAvi_libav.cpp:271:25: warning: ignoring return value of ‘int avformat_write_header(AVFormatContext*, AVDictionary**)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 271 | avformat_write_header(output_format_cx,NULL); | ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ make[2]: *** [CMakeFiles/qastrocam-g2.dir/build.make:814: CMakeFiles/qastrocam-g2.dir/src/QCamMovieAvi_libav.cpp.o] Error 1 make[2]: *** Waiting for unfinished jobs.... /home/qwerty/building/qastrocam-g2-svn/src/qastrocam-g2/src/QCamPhoto2.cpp: In member function ‘bool QCamPhoto2::setSize(int, int)’: /home/qwerty/building/qastrocam-g2-svn/src/qastrocam-g2/src/QCamPhoto2.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type] 33 | } | ^ make[1]: *** [CMakeFiles/Makefile2:111: CMakeFiles/qastrocam-g2.dir/all] Error 2 make: *** [Makefile:166: all] Error 2 ==> ERROR: A failure occurred in build().