Environment Variable
Use the syntax $ENV{VAR} to read environment variable VAR.
https://cmake.org/cmake/help/latest/variable/ENV.html
Example usage
SET(CMAKE_C_COMPILER $ENV{C_COMPILER_PATH_ANDROID})
set(my_var "ANDROID_ARCH=$ENV{ANDROID_ARCH}")
To Verify existence
From Verify Existence
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Verify environment variables are set:
if(NOT DEFINED ENV{C_COMPILER_PATH_ANDROID})
message(FATAL_ERROR "You must set C_COMPILER_PATH_ANDROID environment variable")
endif()
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