Susdo,
Luckily I'm still on 10.8.5 and went through Xcode 3 to 4 to 5 but a colleague of mine ran into issues with the command line tools as well today and she is on 10.9.2
We haven't solved it yet but it seems that the latest XCode 5 no longer has the command line tools as a separate download/install but build into the installation.
From what I've read so far they now get installed into /Library/Developer/CommandLineTools so have a look if they are there.
I wouldn't be surprised if Code::Blocks is not looking in that location nor that paths have been set up to to find them there.
It may be enough to ensure that location is part of your search path.
Cheers,
Bas