--- Libc/Libc-391.4.2/stdio/Makefile.inc
+++ Libc/Libc-391/stdio/Makefile.inc
@@ -29,7 +29,11 @@
 	    vswscanf.c vwprintf.c vwscanf.c wprintf.c wscanf.c
 
 .for _src in vfprintf-fbsd.c vfwprintf-fbsd.c
-CFLAGS-${_src} += -fshort-enums -DVECTORS
+CFLAGS-${_src} += -fshort-enums
+# add altivec options on per file basis, since it now disables inlining
+.if (${MACHINE_ARCH} == ppc) || (${MACHINE_ARCH} == ppc64)
+CFLAGS-${_src} += -faltivec -DALTIVEC
+.endif
 .endfor
 
 UNIX03SRCS+= freopen.c fwrite.c