Question: How to setup project?

[Rephil2]

Hey there!
Thank you for putting out what seems to be a really cool project!
Im a bit of a novice cpp programmer and was wondering if you could help with a compiler issue.
when I hit make this happens:

Making all in tools make[1]: Entering directory '/home/bob/code/cello/tools' CC osd.o In file included from /usr/include/x86_64-linux-gnu/bits/libc-header-start.h:33, from /usr/include/stdio.h:27, from osd.c:9: /usr/include/features.h:187:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp] 187 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" | ^~~~~~~ CC videoformats.o In file included from /usr/include/x86_64-linux-gnu/bits/libc-header-start.h:33, from /usr/include/stdio.h:27, from videoformats.h:4, from videoformats.c:1: /usr/include/features.h:187:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp] 187 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" | ^~~~~~~ CC v210.o In file included from /usr/include/x86_64-linux-gnu/bits/libc-header-start.h:33, from /usr/include/stdio.h:27, from v210.c:2: /usr/include/features.h:187:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp] 187 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" | ^~~~~~~ CXX filter.o In file included from /usr/include/x86_64-linux-gnu/bits/libc-header-start.h:33, from /usr/include/stdio.h:27, from framebase.h:4, from filter.h:4, from filter.cpp:1: /usr/include/features.h:187:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp] 187 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" | ^~~~~~~ In file included from filter.h:4, from filter.cpp:1: framebase.h:18:10: fatal error: libavfilter/avfilter.h: No such file or directory 18 | #include <libavfilter/avfilter.h> | ^~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. make[1]: *** [Makefile:506: filter.o] Error 1 make[1]: Leaving directory '/home/bob/code/cello/tools' make: *** [Makefile:387: all-recursive] Error 1

I have tried looking for dependcies to install in relation to this but nothing useful came up.

if you are able to help that would be amazing!
Cheers!