What's the best way to check if an environment variable is set? I want
to allow a user to set an environment variable
$ SAGE_USE_BROKEN_TOOLS=yes
$ export SAGE_USE_BROKEN_TOOLS
then the configure script check if SAGE_USE_BROKEN_TOOLS is set to 'yes'
or not and behave differently whether or not it is set.
Obviously the configure script checks things like CC, but can I add a
check for my own variable?
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