CMake/CPack: add_custom_command TARGET package POST_BUILD

Question

Having the same problem as here described, I want to execute a shell script as a POST_BUILD command of TARGET "package". Target platform is Debian/Ubuntu.

I add following to the end of my CMakeLists:

 add_custom_command(
     TARGET package
     POST_BUILD
     COMMAND bash ${PROJECT_BINARY_DIR}/fixup_deb.sh
     WORKING_DIRECTORY ${PROJECT_BINARY_DIR} 
     COMMENT "Fix file-permissions of md5sum files in debian package"
 )

But this does not work. When I call "make package" the script doesn't change.

At the moment I have a workaround with a custom target:

 add_custom_target(
     correctDeb        
     COMMAND bash ${PROJECT_BINARY_DIR}/fixup_deb.sh
     WORKING_DIRECTORY ${PROJECT_BINARY_DIR} 
 )

But it would be much more comfortable and more fail-safe for me if this would be automagically done when calling "make package".

By the way, generation of ${PROJECT_BINARY_DIR}/fixup_deb.sh works also well with:

 configure_file( "${CMAKE_CURRENT_LIST_DIR}/debian/fixup_deb.sh.in" "${PROJECT_BINARY_DIR}/fixup_deb.sh" @ONLY IMMEDIATE )