Please note that you followed the instructions for the letter, although I do not see libz.1.2.3.dylib in your post or in your comments. Are you sure you have libz.1.2.3?
Please note that this is not the same as libbz2 or libxml2. If you filter out dylibs, it is right at the bottom.
Edited to add a real answer that was discovered using long comments and comments in the comments
Adjust the header search paths to: ${SDK_DIR}/usr/include/libxml2 , as described in the special instructions for ASIWebPageRequest at: allseeing-i.com/ASIHTTPRequest/ASIWebPageRequest
Matthew frederick
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