graphic: 0.876 device: 0.823 instruction: 0.813 mistranslation: 0.777 vnc: 0.760 other: 0.757 semantic: 0.722 network: 0.677 socket: 0.664 boot: 0.601 assembly: 0.375 KVM: 0.371 Qemu build with -faltivec and maltivec support in if is possible add the build support for qemu for have the -faltivec -maltivec in CPPFLAGS for make the emulation more faster on PPC equiped machine . Thank you 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? Will check it , i had been made my personal build modding the Makefile with altivec commands in CPPFLAGS. i dont know if it was a placebo effect but look like everything is more faster. Closing this ticket since adding CPPFLAGS to configure is possible.