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print ([[

Set the environment variable GT_MEM_BOOKKEEPING=on to enable memory bookkeeping
(e.g., like this: env GT_MEM_BOOKKEEPING=on gt).

Set the environment variable GT_ENV_OPTIONS=-spacepeak to show a spacepeak after
program run.
Set the environment variable GT_ENV_OPTIONS=-showtime to show processing times
for some program parts if implemented.

Combinations are possible. Running the `gt' binary with GT_ENV_OPTIONS=-help
shows all possible ``environment options'')]])