I followed the Mac OS X build instruction but I still found error with building FCollada. I also use google to search some topics of this issue in our forum, and tried to use /libraries/fcollada/src/FCollada/FCollada.xcodeproj to build FCollada, but I found error "no file existing of /libxml/tree.h". I already follow the Mac OS X build intruction and get libxml2 installed. When I search topics in forum, it said I need to us macports to install libxml-dev or libxml2-dev. But when I tried sudo po