[Gretl-users] Need informations

Hello, my name is Leonardo. I need your help: i have a macbook pro. The version that i have is Mac OS X 10.6.4. I'd like to install Gretl, when i download the .dmg application and i try to open it, that produces an error with the apple x11. I tried to download the apple x11 from internet, but when i'm going to install the application it says that i have just installed the recent apple x11 on my Mac. Anybody can help me? Thank you all. Bye. Leonardo