Hi, this is a minor issue but pretty visible.  In latest fltk from
github, every run of fltk-config prints "grep:
/nix/store/c20mk84ykvyfzixcxr0yg41sbrxsrfx4-fltk-1.4-c0f5080cb056919e898ac572e72fd62568dc307a/bin/FL/fl_config.h:
No such file or directory" which is quite frequent if build files are
using it.

I tracked this down to 6546814a23, which inserts a `if grep -q
'^#define FLTK_HAVE_CAIRO 1' $selfdir/FL/fl_config.h` in
fltk-config.in.  Unfortunately this only works if fltk-config is in
the original source directory, and not if it's in an installed
location (nix weirdness above, but /usr/local/bin would have the same
problem I think).  I'm not really sure what the fix is, hence sending
this note rather than a PR!  But presumably it should know if cairo is
configured via @ substitution thing autotools does, rather than trying
to find a header, or at least it could know the absolute path to the
installed header presumably also via magic @s.

Coincidentally, I'm interested in trying out the cairo backend so I'm
glad to see an example in there :)

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