c++ - CMake 'no rule to make target' with external library -

i trying link 1 of programs libevent. using cmake build system. project structure follows:

my_project ├── cmakelists.txt ├── readme.md ├── build │   └── build stuff └── software     ├── readme.md     ├── cmakelists.txt     ├── include     ├── libraries     │   ├── libevent     │   │   └── cmakelists.txt     │   └── anotherlibrary     │       └── cmakelists.txt     ├── prog1     │   ├── cmakelists.txt     ├── prog2     │   ├── cmakelists.txt     └── prog3         └── cmakelists.txt 

cmakelist.txt of prog1 (the 1 that's needs linked libevent)

cmake_minimum_required(version 2.6) project (prog1)  file(glob prog1     "*.h"     "*.cpp" )  include_directories("${project_include_dir}/libevent/include")  add_executable(${project_name} ${prog1}) target_link_libraries(${project_name} event_core) 

but when build project make can't find library build libevent. searched for: libraries/libevent/lib/libevent_core.a wrong path since libevent builds libs inside: my_project/build/software/libraries/libevent/lib/libevent_core.a

how tell cmake search there library? added following lines cmake file wasn't working

     link_directories(/my_project/build/software/libraries/libevent/lib/)      set(cmake_archive_output_directory ${cmake_source_dir}/build/lib)     set(cmake_runtime_output_directory ${cmake_source_dir}/build/bin) 

anyone suggestion?

i fixed problem myself removing content build directory , re running cmake .. inside build directory.

i think cmake somehow not aware of changes made , rebuilding project problem fixed.