--- libavcodec/sparc/simple_idct_vis.c
+++ libavcodec/sparc/simple_idct_vis.c
@@ -384,6 +384,7 @@
         "st %%f14, [%12+" dest "] \n\t"\
 
 
+extern void ff_simple_idct_vis(DCTELEM *data);
 inline void ff_simple_idct_vis(DCTELEM *data) {
     int out1, out2, out3, out4;
     DECLARE_ALIGNED_8(int16_t, temp[8*8]);
--- libmpeg2/idct.c
+++ libmpeg2/idct.c
@@ -265,13 +265,12 @@
 	mpeg2_idct_altivec_init ();
     } else
 #endif
-#ifdef HAVE_VIS
+#ifdef ARCH_ALPHA
     if (accel & MPEG2_ACCEL_ALPHA_MVI) {
 	mpeg2_idct_copy = mpeg2_idct_copy_mvi;
 	mpeg2_idct_add = mpeg2_idct_add_mvi;
 	mpeg2_idct_alpha_init ();
     } else
-#elif ARCH_ALPHA
     if (accel & MPEG2_ACCEL_ALPHA) {
 	int i;