Hello，
I don't know your meaning, SR300-live-test under /librealsense/build/unit_tests isn't a executable file. I install the realsense driver following the instruction (https://github.com/IntelRealSense/librealsense/blob/master/doc/installation.md), and build the library follow the instructions as follows:
mkdir build && cd build
cmake ../
cmake ../-BUILD_EXAMPLES:true
and the built unit_tests files' tree is like this https://drive.google.com/open?id=0B-cl2eRml3L0emQxTk0zNHZDUDA