This library can compile by itself, without needing to compile all of Concord BFT.
Assumption: Your terminal is pointed to the threshsign directory where this README file is.
mkdir -p build/
cd build/
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
make -j `grep -c ^processor /proc/cpuinfo`
You have now successfully built the library, including tests and benchmarks.
(Feel free to change RelWithDebInfo to Debug or Trace if you are debugging and want more verbose logs.)