Provide here solutions to some difficult problems:
Q: <libxml/HTMLParser.h> file not found
A: Add “$SDK_DIR/usr/include/libxml2″ to “header search path" (not “library search path")
Q: ARC get error
A: You may skip ARC for those file not suitable to use ARC. Steps:
1. Go to Target0>Build Phases
2. Open “Compile Sources"
3. Select ALL files you want.
4. Press ENTER (don’t do mouse dbl-click)
5. Enter “-fno-objc-arc"