This post contained information about creating a Linux program that uses Firebird embedded as described here.
It was a way to avoid using a shell script to set the needed environment variables before starting the program. Before posting I tested the solution in the same computer and it worked.
Unfortunately I discovered in a second time that the program does not work on other computers, so I have removed the previous content. I still need a shell script to correctly start the program.
I keep this post because it is linked from other web pages.
Sorry for posting incorrect information.