Problem with there are system-wide install gflags on the system.

[sarsanaee]

Here is the error:

Some (but not all) targets in this export set were already defined.

Targets Defined: gflags_shared;gflags_nothreads_shared

Targets not yet defined: gflags_static;gflags_nothreads_static

This must be addressed via some hints in the CMakefile.