tailspin works by reading through a log file line by line, running a series of matchers against each line. The matchers recognize patterns you expect to find in a logfile, like dates, numbers, ...
Q: There are build errors with Qt 5.*. A: If you are building the development branch you need to use Qt 6.7 or 6.8. If you prefer to install sioyek with a package manager, you can look at this list.