The leading "lib" part from "lib_finder.so" is stripped inside C::B, so the plugin cannot be loaded.
The obvious solution is changing the output file from "lib_finder" to "liblib_finder",
but C::B strips the first "lib" when saving the project so this does not work.
Fix the issue renaming "lib_finder.so" to "liblib_finder.so" in the "update" script
and removing the old "lib_finder.so" from the output folder.