I'm trying to build a small FLTK-using app with cmake under macOS.

Following README.CMake.txt, section 3, I prepared this CMakeLists.txt:

cmake_minimum_required(VERSION 2.6.3)
project(small)
set(FLTK_DIR /Volumes/Extra) # the BUILD dir of FLTK
find_package(FLTK REQUIRED NO_MODULE)
add_executable(small MACOSX_BUNDLE small.cxx)
target_include_directories(small PUBLIC ${FLTK_INCLUDE_DIRS})
target_link_libraries(small fltk)

With it, the build fails at link step (compilation step is good) in that

all macOS-defined symbols are missing.
If I replace the last line of CMakeLists.txt by

      target_link_libraries(small fltk  "-framework Cocoa")

the build succeeds, and a functional macOS bundle is produced.

I had expected cmake to be smart enough to know from

find_package(FLTK REQUIRED NO_MODULE)

that "-framework Cocoa" was necessary in link commands.

Is that incorrect?