http://bugs.gentoo.org/422843
http://pkgs.fedoraproject.org/cgit/libtiff.git/plain/libtiff-4.0.2-bigendian.patch
http://pkgs.fedoraproject.org/cgit/libtiff.git/commit/?id=5f9a7dda1bb1991bf36f98ee37700c75433c9738

--- test/raw_decode.c
+++ test/raw_decode.c
@@ -85,9 +85,9 @@ static int check_rgb_pixel( int pixel, i
 static int check_rgba_pixel( int pixel, int red, int green, int blue, int alpha, unsigned char *buffer ) {
 	/* RGBA images are upside down - adjust for normal ordering */
 	int adjusted_pixel = pixel % 128 + (127 - (pixel/128)) * 128;
-	unsigned char *rgba = buffer + 4 * adjusted_pixel;
+	unsigned int *rgba = (unsigned int*)(buffer + 4 * adjusted_pixel);
 	
-	if( rgba[0] == red && rgba[1] == green && rgba[2] == blue && rgba[3] == alpha ) {
+	if( TIFFGetR(*rgba) == red && TIFFGetG(*rgba) == green && TIFFGetB(*rgba) == blue && TIFFGetA(*rgba) == alpha ) {
 		return 0;
 	}