[CMake] Parsing command line arguments from the make

[Fedja Jeleskovic]

Since I am converting existing makefile project to use cmake instead I need
to accept values that come from command line which looks like this:
VARIABLE_NAME="/home/user/project" make ENV=VERSION_2

First one is used like this:
include $(VARIABLE_NAME)/Makefile.include

Second one has this code that triggers different paths later:
ifneq ($(ENV),)
DEPLOYMENT_VERSION=$(ENV)
endif

How do I do this in cmake?

Thanks!
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