The files fedisblxcpt.c, feenablxcpt.c, feholdexcpt.c, fesetround.c and ftestexcept.c in the directory sysdeps/i386/fpu use HWCAP_I386_XMM but that's only defined in sysdeps/unix/sysv/linux/i386/dl-procinfo.h and thus won't compile on GNU/Hurd. Jeroen Dekkers