Now, why didn't
if ( $ENV{SOME_ENV_VAR} )
work?
Because $ENV{SOME_ENV_VAR} has the same behavior as ${SOME_ENV_VAR}, it
evaluates a variable. The only difference is that ${} is a CMake
variable and $ENV{} is an operating system environment variable.
I assume that IF statement only scan for CMake variables so you must do
like you did: turn the environment variable into a CMake variable to
make the conditional statement work.
--Sylvain
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