diff --git a/libmpeg2/idct.c b/libmpeg2/idct.c
index df4979b63f..b7e0c96480 100644
--- a/libmpeg2/idct.c
+++ b/libmpeg2/idct.c
@@ -253,7 +253,7 @@ void mpeg2_idct_init (uint32_t accel)
 	mpeg2_idct_mmx_init ();
     } else
 #endif
-#ifdef ARCH_PPC
+#if defined(ARCH_PPC) && defined(HAVE_ALTIVEC)
     if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
 	mpeg2_idct_copy = mpeg2_idct_copy_altivec;
 	mpeg2_idct_add = mpeg2_idct_add_altivec;
diff --git a/libmpeg2/libmpeg-0.4.1.diff b/libmpeg2/libmpeg-0.4.1.diff
index 7ea7e27784..be7bd1b51a 100644
--- a/libmpeg2/libmpeg-0.4.1.diff
+++ b/libmpeg2/libmpeg-0.4.1.diff
@@ -373,3 +373,14 @@
      decoder->offset += 16;						\
      if (decoder->offset == decoder->width) {				\
  	do { /* just so we can use the break statement */		\
+--- libmpeg2/idct.c	2006-06-16 20:12:26.000000000 +0200
++++ libmpeg2/idct.c	2006-06-16 20:12:50.000000000 +0200
+@@ -253,7 +253,7 @@
+ 	mpeg2_idct_mmx_init ();
+     } else
+ #endif
+-#ifdef ARCH_PPC
++#if defined(ARCH_PPC) && defined(HAVE_ALTIVEC)
+     if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
+ 	mpeg2_idct_copy = mpeg2_idct_copy_altivec;
+ 	mpeg2_idct_add = mpeg2_idct_add_altivec;