From ChangeLog:

       * test/raw_decode.c (main): Test fixes to work with IJG JPEG 7+.
        IJG JPEG 7+ uses a different upsampling algorithm which produces
        different numeric results.

this seems not apply for libjpeg-turbo. Sent to tiff@lists.maptools.org 
on 2012-11-05.
Index: tiff-4.0.3/test/raw_decode.c
===================================================================
--- tiff-4.0.3.orig/test/raw_decode.c
+++ tiff-4.0.3/test/raw_decode.c 
@@ -191,7 +191,7 @@ main(int argc, char **argv)
 		return 1;
 	}
 
-#if JPEG_LIB_VERSION >= 70
+#if JPEG_LIB_VERSION >= 70 && !defined(LIBJPEG_TURBO_VERSION)
 	pixel_status |= check_rgb_pixel( 0, 18, 0, 41, buffer );
 	pixel_status |= check_rgb_pixel( 64, 0, 0, 0, buffer );
 	pixel_status |= check_rgb_pixel( 512, 5, 34, 196, buffer );
@@ -224,7 +224,7 @@ main(int argc, char **argv)
 	 * accomplish it from the YCbCr subsampled buffer ourselves in which
 	 * case the results may be subtly different but similar.
 	 */
-#if JPEG_LIB_VERSION >= 70
+#if JPEG_LIB_VERSION >= 70 && !defined(LIBJPEG_TURBO_VERSION)
 	pixel_status |= check_rgba_pixel( 0, 18, 0, 41, 255, rgba_buffer );
 	pixel_status |= check_rgba_pixel( 64, 0, 0, 0, 255, rgba_buffer );
 	pixel_status |= check_rgba_pixel( 512, 5, 34, 196, 255, rgba_buffer );