[CMake] Can't build cmake 2.8.1 out of source

[j s]

I am on a macbook, and when I try to compile cmake 2.8.1 using cmake, I get
the following errors:
In file included from
/Users/jsanchez/tclmake/cmake/cmake-2.8.1/Source/kwsys/SystemInformation.cxx:29:
/cmake_debug/Source/cmsys/FundamentalType.h:75:3: error: #error "No native
data type can represent a 16-bit integer."
/cmake/cmake_debug/Source/cmsys/FundamentalType.h:86:3: error: #error "No
native data type can represent a 32-bit integer."
/cmake/cmake_debug/Source/cmsys/FundamentalType.h:106:3: error: #error "No
native data type can represent a 64-bit integer."

How can I fix this?  The Readme.txt  says this should be possible, and that
bootstrap is if you don't have it already installed.

Thanks,

Juan
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