You probably should read [How To Compile SQLite](https://sqlite.org/howtocompile.html). If, after sections 1 and 4 leave you still wanting to build your own amalgamation, you should read [Building The Amalgamation From Canonical Source Code](https://sqlite.org/amalgamation.html#building_the_amalgamation_from_canonical_source_code). On *nix systems, you will be running a "configure" script before expecting make to do the right thing.