...
ccache g++ -c -m64 -pipe -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -march=amdfam10 -DNDEBUG -fomit-frame-pointer -fPIC -DQT_DISABLE_DEPRECATED_BEFORE -msse -pthread -g -Wall -Wpointer-arith -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -fvisibility-inlines-hidden -Wmissing-declarations -Wno-switch -Woverloaded-virtual -funit-at-a-time -I/usr/include/freetype2 -fvisibility=hidden -D_REENTRANT -fPIC -DMMX -Dusing_libcec -D_GNU_SOURCE -DUSING_LIBCRYPTO -DUSING_CRYSTALHD -DUSING_LIBASS -DFFTW3_SUPPORT -DUSING_X11 -DUSING_XV -DUSING_VDPAU -DUSING_OPENGL -DUSING_OPENGL_VIDEO -DUSING_VAAPI -DUSING_GLVAAPI -DUSING_AIRPLAY -DUSING_MHEG -DUSING_FRONTEND -DUSING_FFMPEG_THREADS -DUSING_ALSA -DUSING_OSS -DUSING_V4L2 -DUSING_LINUX_FIREWIRE -DUSING_FIREWIRE -DUSING_IPTV -DUSING_HDHOMERUN -DUSING_CETON -DUSING_IVTV -DUSING_HDPVR -DUSING_DVB -DUSING_BACKEND -DMTV_API -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_SQL_LIB -DQT_XML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 -I. -I/usr/include/libxml2 -I../../external/qjson/include -I.. -I../.. -I../../external/FFmpeg -I. -I../libmyth -I../libmyth/audio -I../libmythbase -Impeg -Ichannelscan -Ivisualisations -Irecorders -Irecorders/dvbdev -Irecorders/rtp -Irecorders/vbitext -Irecorders/HLS -I../libmythlivemedia/BasicUsageEnvironment/include -I../libmythlivemedia/BasicUsageEnvironment -I../libmythlivemedia/groupsock/include -I../libmythlivemedia/groupsock -I../libmythlivemedia/liveMedia/include -I../libmythlivemedia/liveMedia -I../libmythlivemedia/UsageEnvironment/include -I../libmythlivemedia/UsageEnvironment -I../libmythbase -I../libmythui -I../libmythupnp -I../libmythservicecontracts -I../../external/libmythdvdnav/dvdnav -I../../external/libmythdvdnav/dvdread -I../../external/libmythbluray -I../../external/minilzo -I../../external/libhdhomerun -I/usr/include/qt5 -I/usr/include/qt5/QtOpenGL -I/usr/include/qt5/QtWidgets -I/usr/include/qt5/QtSql -I/usr/include/qt5/QtXml -I/usr/include/qt5/QtNetwork -I/usr/include/qt5/QtGui -I/usr/include/qt5/QtCore -I. -o teletextscreen.o teletextscreen.cpp
privatedecoder_crystalhd.cpp: In member function ‘virtual bool PrivateDecoderCrystalHD::Reset()’:
privatedecoder_crystalhd.cpp:380:25: error: ‘usleep’ was not declared in this scope
             usleep(10000);
                         ^
privatedecoder_crystalhd.cpp: In member function ‘int PrivateDecoderCrystalHD::ProcessPacket(AVStream*, AVPacket*)’:
privatedecoder_crystalhd.cpp:442:25: error: ‘usleep’ was not declared in this scope
             usleep(10000);
                         ^
privatedecoder_crystalhd.cpp:476:20: error: ‘usleep’ was not declared in this scope
         usleep(1000);
                    ^
privatedecoder_crystalhd.cpp: In member function ‘void PrivateDecoderCrystalHD::FetchFrames()’:
privatedecoder_crystalhd.cpp:562:20: error: ‘usleep’ was not declared in this scope
         usleep(1000);
                    ^
make[2]: *** [privatedecoder_crystalhd.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/home/bill/source/mythtv/mythtv/libs/libmythtv'
make[1]: *** [sub-libmythtv-make_first] Error 2
make[1]: Leaving directory `/home/bill/source/mythtv/mythtv/libs'
make: *** [libs] Error 2