Package: src:guitarix Version: 0.42.1+dfsg1-2 Tags: patch this is upstream issue https://sourceforge.net/p/guitarix/patches/12/
but it's not GCC 11 causing the issue, but glib2.0 from experimental. package patch at http://launchpadlibrarian.net/540849775/guitarix_0.42.1+dfsg1-2_0.42.1+dfsg1-2ubuntu1.diff.gz
