Tvheadend

Debian 4.9.168-1+deb9u3 (2019-06-16)
gcc 6.3.0

src/descrambler/capmt.c: In function 'capmt_analyze_cmd':
src/descrambler/capmt.c:1511:25: error: initialization discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
char *info = capmt_peek_str(sb, &offset2) ?: "<unknown>";
^_~~~~~~~~~~~
CC src/descrambler/constcw.o
CC src/input/mpegts/en50221/en50221.o
CC src/input/mpegts/en50221/en50221_apps.o
CC src/input/mpegts/en50221/en50221_capmt.o
CC src/input/mpegts/linuxdvb/linuxdvb_ca.o
CC src/descrambler/dvbcam.o
CC src/input/mpegts/linuxdvb/linuxdvb_ddci.o
CC src/descrambler/algo/libaesdec.o
src/descrambler/capmt.c: At top level:
cc1: error: unrecognized command line option '-Wno-stringop-overflow' [-Werror]
cc1: error: unrecognized command line option '-Wno-stringop-truncation' [-Werror]
cc1: all warnings being treated as errors