Hi Sanatan, If you didn't make any copy/paste errors, then I think you made a typo. > add_library(atfwmath RngStream.cpp RngStream.h coin.cpp coin.hpp) > : > : > target_link_libraries(bt atidt atmath boost_date_time boost_program_options) See: atfwmath versus atmath. You should fix your add_library() line. Best regards, Marcel Loose.