on Ubuntu Xenial

[alejoduque]

[ 54%] Linking CXX executable qplayvid
CMakeFiles/qplayvid.dir/qplayvid.c.o: In function decoder_thread': /home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:376: undefined reference to av_read_frame'
/home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:366: undefined reference to av_seek_frame' CMakeFiles/qplayvid.dir/qplayvid.c.o: In function decoder_init':
/home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:419: undefined reference to avformat_open_input' /home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:424: undefined reference to avformat_find_stream_info'
/home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:415: undefined reference to av_find_input_format' CMakeFiles/qplayvid.dir/qplayvid.c.o: In function playvid_init':
/home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:965: undefined reference to av_register_all' /home/a/Desktop/bajotierra/openlase/tools/qplayvid/qplayvid.c:966: undefined reference to avdevice_register_all'
collect2: error: ld returned 1 exit status
tools/qplayvid/CMakeFiles/qplayvid.dir/build.make:157: recipe for target 'tools/qplayvid/qplayvid' failed
make[2]: *** [tools/qplayvid/qplayvid] Error 1
CMakeFiles/Makefile2:387: recipe for target 'tools/qplayvid/CMakeFiles/qplayvid.dir/all' failed
make[1]: *** [tools/qplayvid/CMakeFiles/qplayvid.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2