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/usr/lib/fltk/CMakeCache.txt is in libfltk1.3-dev 1.3.4-4.

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# Fake cmake cache (the Debian build uses configure) to appease
# CMake's picky FindFLTK.cmake.

//Inverted to compensate for FindFLTK.cmake's own inversion(!)
FLTK_USE_SYSTEM_JPEG:BOOL=FALSE
FLTK_USE_SYSTEM_PNG:BOOL=FALSE
FLTK_USE_SYSTEM_ZLIB:BOOL=FALSE