--- CMakeLists.txt.orig	2018-04-14 19:28:38.000000000 -0700
+++ CMakeLists.txt	2018-04-14 19:28:50.000000000 -0700
@@ -241,7 +241,7 @@
     SET(LIBAFTEN_SRCS ${LIBAFTEN_SRCS} ${LIBAFTEN_PPC_SRCS})
     SET(LIBAFTEN_SRCS ${LIBAFTEN_SRCS} ${LIBAFTEN_ALTIVEC_SRCS})
     FOREACH(SRC ${LIBAFTEN_ALTIVEC_SRCS})
-      SET_SOURCE_FILES_PROPERTIES(${SRC} PROPERTIES COMPILE_FLAGS "-maltivec")
+      SET_SOURCE_FILES_PROPERTIES(${SRC} PROPERTIES COMPILE_FLAGS "-faltivec -maltivec")
     ENDFOREACH(SRC)
     ADD_DEFINE(HAVE_ALTIVEC)