This variable allows you to define the filename extension for UNIX/Linux shared object libraries. The default value matches the standard value for the host system. This variable has meaning only on systems that support UNIX shared libraries.

Note: Prior to version 9.0, the default value was fixed as .so. However, some systems use a different shared library extension so now the default value matches the extension used on the shared libraries in the lib directory. You may need to update the value of the SHARED_LIBRARY_EXTENSION configuration variable if you were relying on it always being to .so.