From Synfig

[edit] Synfig 0.61.03

Thursday, December 8, 2005 by darco

This time I have confirmed that this version will build with GCC 4 on Debian. I can only assume that if there are issues on other distributions or platforms, that it is not related to GCC 4. Other than that, there isn't too much new in this build. I figured I was sitting on the GCC 4 fix in subversion long enough. Grab it from the download page. Win32 and MacOSX binaries are also available.