[Insight-users] CMake warning(dev) in Cmakelists.txt

[michael ma]

HI guys,
when I use Cmake to configure examples surported by itk, it always have Cmake warning below:
 
cmake warning(dev) in cmakelist.txt: 
    no cmake_required comond is present.A line of code such as cmake minimum required(versin 2.6) should at the top of the file. the version specified may be lower if you wish to support older CMake versions for this project.
 
what does that mean? what should I do?
 
 thanks in advance for any help.
 
Best,
Michael
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