Created attachment 1926931 [details] arts-c99.patch I couldn't find the arts upstream on the KDE web site, so I'm filing this bug for tracking purposes.
aRts is part of the KDE 3 compatibility stack and long discontinued upstream. The only place that may be interested is Trinity Desktop, but that is not the code base we ship (because it stopped being a binary-compatible drop-in replacement soon after it was forked, making it not very useful for compatibility libraries – we do backport patches from Trinity where useful though). Also, they will only be interested in the flow/gsl/gslglib.c hunk because they ported the build system from autotools to CMake.
In any case, thanks for fixing the Fedora package, that is appreciated!
Created attachment 2000878 [details] arts-c99.patch Updated patch that also fixes a -Wreturn-mismatch problem.