i386: linbox-1.7.0 fails to build #38000
Description
For example on standard-pre / linux (ubuntu-bionic-gcc_8-i386, standard)
#25 6597.9 [linbox-1.7.0] [spkg-install] ../../linbox/algorithms/polynomial-matrix/fft-integral.inl:1404:49: error: incomplete type 'Simd256<long long unsigned int>' {aka 'Simd256_impl<true, true, false, 8>'} used in nested name specifier
#25 6597.9 [linbox-1.7.0] [spkg-install] V2 = Simd256<uint64_t>::permute128<0x31> (V3, V4);
#25 6597.9 [linbox-1.7.0] [spkg-install] ^~~~~~~~~~
#25 6597.9 [linbox-1.7.0] [spkg-install] Makefile:679: recipe for target 'diophantine-solver.lo' failed