[Discuss-gnuradio] CMake error related to log4cpp in non-standard location

The current GR CMakeFile(s) apparently do not add the include path LOG4CPP_INCLUDE_DIR to the compile.  Can't build w/ log4cpp in non-standard location.

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Eugene Grayver, Ph.D.
Aerospace Corp., Sr. Eng. Spec.
Tel: 310.336.1274
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