There are other header files missing from lib6-dev in 20.04. I just had to fetch libio.h and _G_config.h from an old Ubuntu 18.04 to compile a programme on 20.04.
There are other header files missing from lib6-dev in 20.04. I just had to fetch libio.h and _G_config.h from an old Ubuntu 18.04 to compile a programme on 20.04.