Hi! configure.ac contains around line 50 the following:
case $host_cpu in i[]86*|x86_64*) AX_CPU_VENDOR() if test "x$ax_cv_cpu_vendor" = "xIntel"; then AX_EXT() # SSE2 is slower on the Opteron fi esac
which allows SSE2 instructions only for Intel cpus. I have been told (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=702287) that the fact that AMD cpus are slower with SSE2 is not true anymore. Could you please consider removing the if/fi lines and just call AX_EXT()?