[webkit-dev] image+text test failure

[スチン ビリゴ]

Hi all :
I want to building webkit on my Mac Pro Book (Lion 10.7.5).

According to the webkit.org site,
1. Installing Developer Tools OK
2. Getting the Code OK
3. Building WebKit OK
4. Running WebKit OK
5. Run the layout tests. When I confirm the result, there is a image+text test failure like this picture.

What is wrong with me ?

SiqinBilige