Hi Thomas,
Currently it is not possible to install DomSQL in a Domino server on Linux.
From the DominoJDBCAccess.pdf :
DomSQL currently only works on Windows, 32 and 64 bits. While most of the JDBC driver and the remote server is written in Java, the SQLite engine is a C library and thus must be compiled for each supported platforms. There are no technical blockers in supporting more platforms, it is just a matter of time, test, and use cases.
The source code is attached in the project if you want to take a closer look. We received good feedback on this project at Engage so we will review those comments and your request.
Thanks,
Padraic