Adding libxml2 is a big, fat, finicky pain in the ass. If you're going to do it do it before you get too far in building your project.
Here's how.
Target settings
Click on your target (not your project) and select "Build Phases". Click on the reveal triangle titled "Link Binary With Libraries". Click on the "+" to add a library. Scroll to the bottom of the list and select "libxml2.dylib". That adds the libxml2 library 2 your project… but wait.
Project settings
Now you have to tell your project where to look for it three more times.
Select the "Build Settings tab". Scroll down to the "Linking" section. Under your project's columns double click on the "Other Linker Flags" row. Click the "+" and add "-lxml2" to the list.
Still more.
In the same tab, scroll down to the "Search Paths" section. Under your project's column in the"Framework Search Paths" row add "/usr/lib/libxml2.dylib".
In the "Header Search Paths" AND the "User Header Search Paths" row add"$(SDKROOT)/usr/include/libxml2". In those last two cases make sure that path is entered in Debug AND Release.
Then. Under the "Product" Menu select "Clean".
Then, if I were you (and let's face it I probably am) I'd quit Xcode and walk away. When you come back and launch you should be good to go.
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