llvm dev - May 2015 - [LLVMdev] Missing llvm/Support/DataTypes.h file

Missing llvm/Support/DataTypes.h file
 
but there existing two files:
 
DataTypes.h.cmake & DataTypes.h.in
 
what are their func???
 
i was trying the example listed on the 
 
ch.3, page[66]-----Writing the code 
 
of Getting Started with LLVM Core Libraries, 
 
i exactly copy the code, but it can't work, and told me missing DataTypes.h
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