Unable to compile my project with libxml2 and XCode 4.4

Question

My project was working without errors on XCode 4.2 on Lion. Now I'm running Mountain Lion with XCode 4.4 and when I try to build the project it gives me an error that tree.h file cannot be found. I checked the header search path and it was correct. I searched the web for such an error and found the same solution on many different pages but couldn't understand that particular solution, see for example this page.

How can I solve this problem? Alternately, can you clarify the weird solution that is spread all over the internet?

Answer 1

I had to add another header search path which is: $(SDKROOT)/usr/include/libxml2. This fixed the problem.

Answer 2

Go in the XCode preferences and install the command line tools.