fltk1.3 (1.3~r7710-1) experimental; urgency=low Per http://www.fltk.org/str.php?L2259, fluid no longer produces (empty) implementations for empty functions in .fl files. You can override this behavior by arranging for their bodies to contain comments, either within fluid's GUI or by hand-editing the relevant portions of .fl files to read something along the lines of Function {foo()} {... } { comment {This body intentionally left blank.} {in_source not_in_header } } rather than Function {foo()} {... } {} Apologies for any resulting disruption. -- Aaron M. Ucko Tue, 12 Oct 2010 18:17:39 -0400