Include path not found - c

I recently upgraded to Mavericks OS and XCode 5. Eclipse is showing me the following warning with any C projects that I'm working on:
Invalid project path: Include path not found >(/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple->darwin11/4.2.1/include).
It is unable to find the standard C libraries like stdio. Hovering over #includes <stdio.h> tells me 'Unresolved Inclusion: stdio.h'.
My project is able to compile in Eclipse, and via command line using gcc. Previously, before upgrading, Eclipse did not warn this.. Appreciate any assistance rendered.

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To check your working directory, choose terminal tab and type 'pwd'.

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it worked for me. hope it will work for u and others as well!! :)
EDit : for linux users
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