As reported on sage-devel: https://groups.google.com/g/sage-devel/c/7RIv9Dg618k/m/zo0fiMW5AAAJ As well, a Debian bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1093321 TL;DR g++: error: @SIMD_CFLAGS@: linker input file not found: No such file