GCC is the GNU Compiler Collection. It's the de facto standard C compiler on Linux and older versions of OS X.

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Why does it appear that I apparently “do not have access to Command Line Tools” in ML?

I just upgraded to Mountain Lion, and now gcc, make, g++, etc. are not found when trying to launch them in Terminal. So I went to Xcode Preferences, Downloads, and clicked "Install" next to Command ...
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I installed Xcode but I still don't have gcc in my terminal

I just got a Mac and I'm a complete newbie, so this may be kind of a really easy question, but I wasn't able to solve it with Google or F1. I was trying to run a C program from the Terminal that ...