Thanks! My first build attempt failed with this:
CMake Error at /opt/cmake/share/cmake-3.9/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find GMP (missing: GMP_LIBRARIES GMP_INCLUDE_DIR)
Call Stack (most recent call first):
/opt/cmake/share/cmake-3.9/Modules/FindPackageHandleStandardArgs.cmake:377 (_FPHSA_FAILURE_MESSAGE)
libraries/fc/CMakeModules/FindGMP.cmake:50 (find_package_handle_standard_args)
libraries/fc/CMakeLists.txt:20 (find_package)
Still working through it.