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If SDL_ALTIVEC_BLITTERS is defined, compilation of SDL_blit_A.c for PPC fails with the following error:

./src/video/SDL_blit_A.c: In function 'Blit32to32SurfaceAlphaKeyAltivec':
./src/video/SDL_blit_A.c:758: error: 'alpha' undeclared (first use in this function)
./src/video/SDL_blit_A.c:758: error: (Each undeclared identifier is reported only once
./src/video/SDL_blit_A.c:758: error: for each function it appears in.)
./src/video/SDL_blit_A.c: In function 'Blit32to32SurfaceAlphaAltivec':
./src/video/SDL_blit_A.c:1074: error: 'alpha' undeclared (first use in this function)

I have no idea if this is correct, but judging from the rest of the changes in <http://libsdl.org/cgi/viewvc.cgi/trunk/SDL/src/video/SDL_blit_A.c?r1=3426&r2=3428&diff_format=l>, the fix could look about like this:

--- src/video/SDL_blit_A.c	2007-08-18 05:39:09 +0000
+++ src/video/SDL_blit_A.c	2007-12-29 20:59:19 +0000
@@ -755,7 +755,7 @@
     vsdstPermute = calc_swizzle32(dstfmt, NULL);
 
     /* set a vector full of alpha and 255-alpha */
-    ((unsigned char *) &valpha)[0] = alpha;
+    ((unsigned char *) &valpha)[0] = sA;
     valpha = vec_splat(valpha, 0);
     vbits = (vector unsigned char) vec_splat_s8(-1);
 
@@ -1071,7 +1071,7 @@
     vsdstPermute = calc_swizzle32(dstfmt, NULL);
 
     /* set a vector full of alpha and 255-alpha */
-    ((unsigned char *) &valpha)[0] = alpha;
+    ((unsigned char *) &valpha)[0] = sA;
     valpha = vec_splat(valpha, 0);
     vbits = (vector unsigned char) vec_splat_s8(-1);