Not sure if this is the right place for this command, regarding the 
cmake-2.8.12.1 problem:

The problem is caused by target_include_directories with the SYSTEM keyword.
cmake-2.8.11 (saucy) does not have it.

As far as I understand, the SYSTEM keyword is nothing serious for making it 
work at all. See 
http://www.cmake.org/cmake/help/git-master/command/target_include_directories.html

So it is pretty straightforward to make a little patch for saucy which removes 
the SYSTEM keyword and lowers the cmake minimum version to 2.8.11. It may 
generate more warnings, but it compiles.

This does not help with precise, though. cmake-2.8.7 does not understand 
target_include_directories. 
-- 
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