CMake did not find GTSAM

[YouShaoze]

CMake Error at CMakeLists.txt:6 (find_package): By not providing "FindGTSAM.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "GTSAM", but CMake did not find one.

Could not find a package configuration file provided by "GTSAM" with any of the following names:

GTSAMConfig.cmake
gtsam-config.cmake

Add the installation prefix of "GTSAM" to CMAKE_PREFIX_PATH or set "GTSAM_DIR" to a directory containing one of the above files. If "GTSAM" provides a separate development package or SDK, be sure it has been installed.

-- Configuring incomplete, errors occurred! See also "/home/ysz/em_exploration/build/CMakeFiles/CMakeOutput.log".