Is your feature request related to a problem? Please describe.

This is a feature request albeit I consider it a bug, as FLTK is the only library that exhibits this.

When building FLTK with ExternalProject_Add and setting CMAKE_PREFIX_PATH to the same install location of CMAKE_INSTALL_PREFIX, FLTK will read the .H files from CMAKE_INSTALL_PREFIX first instead of those from its own checkout FL directory, leading often to having the .H and .cxx files become out of sync.

I am using FLTK

• Version 1.4.0 master

Describe the solution you'd like
FLTK should build with its contents only putting its internal Fl/ direcory first in the list of include directories, so FLTK builds in a sandbox.
I think something is broken in the CMake build files that makes FLTK not do this.

Describe alternatives you've considered
None. Currently I am being forced to remember to do:

rm -rf $BUILD_DIR/include/FL

but that is error prone.

Additional context
Thank you Albrecht and sorry for drawing you insane with CMake requests 👍

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