Why am I getting this “libxml/tree.h file not found” error?

Question

I just installed Xcode version 4.3.1 and I get this error:

libxml / tree.h file not found

I have also installed Xcode 4.2, and

Answer 1

In my case, the main difficulty was that the app is composed of two projects, with the second one having several targets. It took me a while to realise that the error was occurring in one of those targets and not in the target of the main project. Then I just had to add the (in)famous $(SDKROOT)/usr/include/libxml2 in the Header Search Paths of that particular target.

I am using Xcode Version 5.0.1