Mac running c program using gcc

Question

Whenever I try to compile my c program on mac it gives the following error. I am completely clueless about it.

'sys/cdefs.h' file not found

Answer 1

have you installed "Xcode Command Line Tools" ? just install it in your terminal.

sudo xcode-select --install

Answer 2

Install Xcode, if you haven't already.

Then, from Terminal do the following to avoid future similar (not necessary just for this, I don't think) issues in future:

xcode-select --install

This will automatically download and install the latest XCode Command Line Tools.

Answer 3

From Xcode 4.3 , the Xcode is installed from Mac App Store. By default, there is no command line tools. Probably you have missed it. They can be installed using the Components tab of the Downloads preferences panel.