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* Logging libs for c/c++.

See below. Note that this libs complicate and its goal to provide
functionality similar to log4j.

** log4c.

See

  http://log4c.sourceforge.net/

** log4cplus.

See

  http://log4cplus.sourceforge.net/

** Log for C++.

Stop maintained at 2003.

See

  http://log4cpp.sourceforge.net/

* log4j.

Apache log4j is a Java-based logging utility.

See

  http://logging.apache.org