Comment 1 for bug 749121

This bug is fixed on synfig's master branch, but the patch isn't part of a release yet. There's also three other patches aimed at fixing build errors. See the last four commits here: http://synfig.git.sourceforge.net/git/gitweb.cgi?p=synfig/synfig;a=shortlog;h=9cf7dfc6c44cf2aa5a27fc6baad10fae22bed319

Changing sigc::connection::connection to sigc::connection will fix the problem.