The sqlite-jdbc project page, which your link reaches, lists among its top-level files a "README_BUILD.md", whose link reaches <u>[How to compile a new version of SQLiteJDBC](https://github.com/xerial/sqlite-jdbc/blob/master/README_BUILD.md)</u>. That is where the answer to your question lies. This forum is about the SQLite library itself, its CLI shell, and how it works -- not about how it might be built into the multitude of applications, adapters, languages, and libraries that happen to use SQLite. The nitty-gritty of "how did they compile the source code" is in a file listed on the project page named "Makefile". You can follow the build instructions with a -n flag added to the make invocation to get make to say what it would do instead of doing it.