farneback_analyser.cpp not compiled

Hi all.
lives-3.0.2's farneback_analyser.cpp is not compiled on Fedora with this error:
libtool: compile:  g++ -DPACKAGE_NAME=\"LiVES\" -DPACKAGE_TARNAME=\"lives\" -DPACKAGE_VERSION=\"3.0.2\" "-DPACKAGE_STRING=\"LiVES 3.0.2\"" -DPACKAGE_BUGREPORT=\"https://github.com/salsaman/LiVES/issues\" -DPACKAGE_URL=\"http://lives-video.com\" -DPACKAGE=\"lives\" -DVERSION=\"3.0.2\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -D__EXTENSIONS__=1 -D_ALL_SOURCE=1 -D_GNU_SOURCE=1 -D_POSIX_PTHREAD_SEMANTICS=1 -D_TANDEM_SOURCE=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_PTHREAD=1 -DGETTEXT_PACKAGE=\"lives\" -DLOCALEDIR=\"/usr/share/locale\" -DPREFIX=\"/usr\" -DLiVES_VERSION=\"3.0.2\" -DHAVE_VISIBILITY=1 -DHAVE_STDINT_H_WITH_UINTMAX=1 -DHAVE_ALLOCA_H=1 -DHAVE_ALLOCA=1 -DHAVE_STDLIB_H=1 -DHAVE_UNISTD_H=1 -DHAVE_SYS_PARAM_H=1 -DHAVE_GETPAGESIZE=1 -DHAVE_MMAP=1 -DINTDIV0_RAISES_SIGFPE=1 -DHAVE_INTTYPES_H_WITH_UINTMAX=1 -DHAVE_UNSIGNED_LONG_LONG_INT=1 -DHAVE_UINTMAX_T=1 -DHAVE_INTTYPES_H=1 -DUSE_POSIX_THREADS=1 -DUSE_POSIX_THREADS_WEAK=1 -DHAVE_PTHREAD_RWLOCK=1 -DHAVE_PTHREAD_MUTEX_RECURSIVE=1 -DHAVE_BUILTIN_EXPECT=1 -DHAVE_ARGZ_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_LIMITS_H=1 -DHAVE_UNISTD_H=1 -DHAVE_SYS_PARAM_H=1 -DHAVE_GETCWD=1 -DHAVE_GETEGID=1 -DHAVE_GETEUID=1 -DHAVE_GETGID=1 -DHAVE_GETUID=1 -DHAVE_MEMPCPY=1 -DHAVE_MUNMAP=1 -DHAVE_STPCPY=1 -DHAVE_STRCASECMP=1 -DHAVE_STRDUP=1 -DHAVE_STRTOUL=1 -DHAVE_TSEARCH=1 -DHAVE_ARGZ_COUNT=1 -DHAVE_ARGZ_STRINGIFY=1 -DHAVE_ARGZ_NEXT=1 -DHAVE___FSETLOCKING=1 -DHAVE_DECL_FEOF_UNLOCKED=1 -DHAVE_DECL_FGETS_UNLOCKED=1 -DHAVE_ICONV=1 -DICONV_CONST= -DHAVE_NL_LOCALE_NAME=1 -DHAVE_LONG_LONG_INT=1 -DHAVE_WCHAR_T=1 -DHAVE_WINT_T=1 -DHAVE_INTMAX_T=1 -DHAVE_POSIX_PRINTF=1 -DHAVE_STDINT_H=1 -DHAVE_STDINT_H=1 -DHAVE_STDDEF_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_ASPRINTF=1 -DHAVE_FWPRINTF=1 -DHAVE_PUTENV=1 -DHAVE_SETENV=1 -DHAVE_SETLOCALE=1 -DHAVE_SNPRINTF=1 -DHAVE_WCSLEN=1 -DHAVE_DECL__SNPRINTF=0 -DHAVE_DECL__SNWPRINTF=0 -DHAVE_DECL_GETC_UNLOCKED=1 -DHAVE_LANGINFO_CODESET=1 -DHAVE_LC_MESSAGES=1 -DENABLE_NLS=1 -DHAVE_GETTEXT=1 -DHAVE_DCGETTEXT=1 -DHAVE_LIBDL=1 -DHAVE_POSIX_MEMALIGN=1 -DHAVE_POSIX_FADVISE=1 -DHAVE_POSIX_FALLOCATE=1 -DHAVE_SYS_PRCTL_H=1 -DHAVE_LINUX_JOYSTICK_H=1 -DHAVE_JACK_JACK_H=1 -DHAVE_JACK_TRANSPORT_H=1 -DHAVE_BZLIB_H=1 -DHAVE_LADSPA_H=1 -DHAVE_LIBV4L1_VIDEODEV_H=1 -DHAVE_LINUX_VIDEODEV2_H=1 -DHAVE_FREI0R_H=1 -DHAVE_LIBRAW1394_RAW1394_H=1 -DHAVE_LIBAVC1394_AVC1394_H=1 -DHAVE_LIBAVC1394_ROM1394_H=1 -I. -fPIC -DPIC -Wno-unused-function -ffast-math -Wall -I/usr/include/tirpc -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -fcommon -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -c farneback_analyser.cpp  -fPIC -DPIC -o .libs/farneback_analyser_la-farneback_analyser.o
make[3]: Leaving directory '/builddir/build/BUILD/LiVES-3.0.2/lives-plugins/weed-plugins'
farneback_analyser.cpp: In function 'int farneback_process(weed_plant_t*, weed_timecode_t)':
farneback_analyser.cpp:178:31: error: 'CV_RGB2GRAY' was not declared in this scope
  178 |     cvtColor(srcMat, *cvgrey, CV_RGB2GRAY); // may segfault here, not sure what causes it. Bug in opencv 2.4 ?
      |                               ^~~~~~~~~~~
farneback_analyser.cpp:182:31: error: 'CV_BGR2GRAY' was not declared in this scope
  182 |     cvtColor(srcMat, *cvgrey, CV_BGR2GRAY);
      |                               ^~~~~~~~~~~
make[3]: *** [Makefile:1625: farneback_analyser_la-farneback_analyser.lo] Error 1
GCC-10.0.1 Fedora 32+ Opencv-4.2.0 Full build log: http://koji.rpmfusion.org/koji/getfile?taskID=388630&volume=DEFAULT&name=build.log
salsaman / LiVES

farneback_analyser.cpp not compiled #6
