[CMake] environment variables & scope

[James C. Sutherland]

How do I set an environment variable so that it is visible globally in  
CMake?  Specifically, I want to have it visible when I run something  
like:

#-----------------------------------
# set the environment variable value
set( ENV{myVariable} ... )

# run a test through a CMake script that requires the environment  
variable set above.
add_test( myTest
   ${CMAKE_COMMAND}
   -D exe_name:STRING=myExecutable
   -P ${PROJECT_SOURCE_DIR}/test_problems/run_test.cmake
   )
#-----------------------------------

In the "run_test.cmake" file I would like to have "myVariable"  
available as an environment variable, but it is not, despite the fact  
that it was set prior to the execution of "run_test.cmake".

What am I missing here?

James

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