Fix checking if environment variable is defined #308
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The correct way to check if an environment variable is defined is to use `if(DEFINED ENV{})`.
See: https://cmake.org/pipermail/cmake/2011-October/046704.html
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zhaozg
approved these changes
Nov 15, 2018
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The correct way to check if an environment variable is defined is to use
if(DEFINED ENV{}).See: https://cmake.org/pipermail/cmake/2011-October/046704.html