Ubuntu 20.04 undefined symbol

#1

Hello, I installed vcmi in UBuntu 20.04 from the multiverse repository. When I run it I get this error:

vcmiclient: symbol lookup error: /usr/lib/x86_64-linux-gnu/libSDL2_image-2.0.so.0: undefined symbol: SDL_RWseek

I’d try the ppa with the daily builds, but when adding that ppa I get this error:

E: The repository 'http://ppa.launchpad.net/vcmi/ppa/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

I tried building from source and vcmilauncher, vcmiserver and vcmitest actually built succesfully but vcmiclient failed with an Error 2 I’m not able to understand.

#2

Expanding on my issue, I found these two interesting errors when building:

/home/tony/src/VCMI/vcmi/client/gui/Fonts.cpp:13:10: fatal error: SDL_ttf.h: No such file or directory
...
/home/tony/src/VCMI/vcmi/client/gui/CAnimation.cpp:13:10: fatal error: SDL_image.h: No such file or directory

but I have the relevant packages installed as per instructions and those header files are in fact in my system:

/usr/include/SDL2/SDL_ttf.h
/usr/include/SDL2/SDL_image.h

Anyone trying to build VCMI under Ubuntu 20.04?