MFC r284425:
MFC r284425:

Skip src component if /usr/src is empty.

Submitted by:		kczekirda
Reviewed by:		cperciva, delphij, nwhitehorn, allanjude

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase