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

Xcode 6:

Do the following:

1.0)Select "mainApp" Target : Go to settings ->In "Header Search Path"

1.1)Add this: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/libxml2.

2.0)Select "TestApp" Target : Go to settings ->In "Header Search Path"

2.1)Add this: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/libxml2.