On Thursday 20 September 2012 17:25:35 Reza Housseini wrote: > set(CPPLIB_DIR "${CMAKE_SOURCE_DIR}/../core/build") > find_library(CPPLIB_SIEVE_LIBRARY NAMES libsieve PATHS CPPLIB_DIR) Use instead sieve for your library name. Also, check with message(${CPPLIB_DIR}) the path to your library -- Bogdan