LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=both" breaks howl, patch attached (fixed libhowl linking).
Created attachment 92011 [details, diff] files/howl-as-needed.patch
howl is no longer maintained upstream. I am not going to apply this patch since this package is going to be dropped soon anyways. Please migrate towards avahi.