Which environment variable you have to setup to use shared libraries that are not in the standard search path?

Which environment variable you have to setup to use shared libraries that are not in the standard search path?

Answer: LD_LIBRARY_PATH

Explanation:
See http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html
You can temporarily substitute a different library for this particular execution. In Linux, the environment variable LD_LIBRARY_PATH is a colon-separated set of directories where libraries should be searched for first, before the standard set of directories; this is useful when debugging a new library or using a nonstandard library for special purposes