View source code in Safari 6 (Mountain Lion)

Safari6 hides some development tool such like "view source code" by default. To enable that, go to

• Preferences 
• => Advanced Settings 
• => enable "Show Develop menu in menu bar".

After that, Develop tab will be shown in menu bar, of course you can view source code now.

Enable gcc command line tools for Mountain Lion

Seems Mountain Lion (Xcode 4.4) disable gcc command line tools by default.
Followings are the way to install it:

Xcode -> Preferences -> Download -> Components -> Command Line Tools -> install