Comment 1 for bug 1399939

We assume that your C compiler generates decently optimised code that uses the features of your host CPU with just the standard -O2 optimisation flag. If this isn't the case, you can use configure's --extra-cflags argument (eg "--extra-cflags=-faltivec -maltivec") to get the build process to pass arbitrary flags to the compiler. Is that not sufficient here?