upgrade gives compiling issue

[aroundmyroom]

I'm getting this issue when running the upgrade script from 1.5.2 to 1.5.3, but cannot relate what I have to to do fix this one ..
Guac is working, so it's not a massive issue, but no clue what it should do or give me as feature.

/usr/bin/install -c -m 644 systemd/guacd.service '/etc/systemd/system'
make[2]: Leaving directory '/home/upgrade/guacamole-server-1.5.3/src/guacd'
make[1]: Leaving directory '/home/upgrade/guacamole-server-1.5.3/src/guacd'
Making install in src/guacenc
make[1]: Entering directory '/home/upgrade/guacamole-server-1.5.3/src/guacenc'
CC guacenc-video.o
video.c: In function 'guacenc_video_alloc':
video.c:63:22: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
63 | container_format = container_format_context->oformat;
| ^
video.c:66:22: error: initialization discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
66 | AVCodec* codec = avcodec_find_encoder_by_name(codec_name);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [Makefile:1126: guacenc-video.o] Error 1
make[1]: Leaving directory '/home/upgrade/guacamole-server-1.5.3/src/guacenc'
make: *** [Makefile:544: install-recursive] Error 1
Starting tomcat and guacamole...