[CMake] -D constants

[stephan ripke]

Hello,
I am a cmake-beginner and I want to "translate" my old project for use with
cmake:
1) I brought some constants with the preprocessor from the Makefile into my
sourcecode (e.g.: g++ -Dconstant=10 main.cpp). How do I do something like
this with cmake?
2) Are there constants like "Windows" "Unix" "Linux", so
the compiling of my project could react depending on the system?

Sorry for these beginner-questions, but I did not find these solutions on
the website...

Thanks,
Stephan
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