> I will modify CMake/options.cmake to use the -isysroot option only
> when CMAKE_OSX_SYSROOT is defined.

> Since cmake defines it in my hands, I would like to try and understand
> why it doesn't in Greg's.


As something of a tangent, the autoconf build of fltk-1.4 on my 10.13 system never uses -sysroot, as far as I can tell, and "everything" seems to Just Work.

It also uses "gcc" and "g++" to call the compiler (which are actually just Apple's wrappers) rather than the "full path" to the actual compiler, that cmake seems to prefer...




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