FindFLTK.cmake appears to be intended for fltk1.1, as upstream fltk1.3
recommend not using it at all (for either shared or static linking):
https://sources.debian.net/src/fltk1.3/1.3.3-2/README.CMake.txt/#L233
For an example of such shared FLTK linking, see
http://sources.debian.net/src/fgrun/3.4.0.final-1/CMakeLists.txt/
(Note that using shared mode won't stop it also linking your program
against fltk's own dependencies (libcairo/libpng/...): that's #793517.)
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