040000 tree 3971247ec3e4cae746f23667aedd4a54ab2864c5	abseil-cpp
040000 tree e7b4865658f1db1bc9b101b03625968aa5c954c2	benchmark
040000 tree 03e91785106ae53f5ce6d8bd25090336590a3cef	eigen
040000 tree c4ece94003049f65f9274545b072427218beea84	gflags
040000 tree d9005c934548dc63053a2c2da2e3f8c905a1b320	gtest