diff --git a/libmpeg2/idct.c b/libmpeg2/idct.c
index bcae078156..fd1515b160 100644
--- a/libmpeg2/idct.c
+++ b/libmpeg2/idct.c
@@ -241,12 +241,14 @@ void mpeg2_idct_init (uint32_t accel)
     } else
 #endif
 #ifdef ARCH_PPC
+#ifdef HAVE_ALTIVEC
     if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
 	mpeg2_idct_copy = mpeg2_idct_copy_altivec;
 	mpeg2_idct_add = mpeg2_idct_add_altivec;
 	mpeg2_idct_altivec_init ();
     } else
 #endif
+#endif
 #ifdef ARCH_ALPHA
     if (accel & MPEG2_ACCEL_ALPHA_MVI) {
 	mpeg2_idct_copy = mpeg2_idct_copy_mvi;
diff --git a/libmpeg2/motion_comp.c b/libmpeg2/motion_comp.c
index 25c001584d..0e6788f169 100644
--- a/libmpeg2/motion_comp.c
+++ b/libmpeg2/motion_comp.c
@@ -42,10 +42,12 @@ void mpeg2_mc_init (uint32_t accel)
     else
 #endif
 #ifdef ARCH_PPC
+#ifdef HAVE_ALTIVEC
     if (accel & MPEG2_ACCEL_PPC_ALTIVEC)
 	mpeg2_mc = mpeg2_mc_altivec;
     else
 #endif
+#endif
 #ifdef ARCH_ALPHA
     if (accel & MPEG2_ACCEL_ALPHA)
 	mpeg2_mc = mpeg2_mc_alpha;