Add Cairo include directories for FLTK 1.4 widget opcodes - #33
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FLTK 1.4 built with Cairo support (FLTK_HAVE_CAIRO) includes <cairo.h> from <FL/Fl.H> via Fl_Cairo.H. cairo.h lives under a subdirectory such as /usr/include/cairo, which CMake's module-mode FindFLTK does not add to the include path. Without those directories, building the widgets and virtual keyboard plugins fails with: fatal error: cairo.h: No such file or directory Look up cairo.h (PATH_SUFFIXES cairo) and, when found, add its include directory to both FLTK plugin targets. This is a no-op for FLTK 1.3 builds that do not pull in Cairo headers.
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FLTK 1.4 built with Cairo support (FLTK_HAVE_CAIRO) includes <cairo.h> from <FL/Fl.H> via Fl_Cairo.H. cairo.h lives under a subdirectory such as /usr/include/cairo, which CMake's module-mode FindFLTK does not add to the include path.
Without those directories, building the widgets and virtual keyboard plugins fails with:
fatal error: cairo.h: No such file or directory
Look up cairo.h (PATH_SUFFIXES cairo) and, when found, add its include directory to both FLTK plugin targets. This is a no-op for FLTK 1.3 builds that do not pull in Cairo headers.