help me installing gcc

[kjy9308@…]

i installed xcode, macport.

i want to install gcc

but failed....

MacProRain:~ EPRI$ sudo port install gcc47 Warning: The Xcode Command Line Tools don't appear to be installed; most ports will likely fail to build. Warning: You can install them from Xcode's Preferences in the Downloads section. Warning: See ​http://guide.macports.org/chunked/installing.xcode.html#installing.xcode.lion.43 for more information. ---> Computing dependencies for gcc47Error: Unable to execute port: can't read "build.cmd": Failed to locate 'make' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?

what's the problem?