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3.5 'OMP_MAX_ACTIVE_LEVELS' - Set the maximum number of nested parallel regions
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_Description_:
     Specifies the initial value for the maximum number of nested
     parallel regions.  The value of this variable shall be a positive
     integer.  If undefined, then if 'OMP_NESTED' is defined and set to
     true, or if 'OMP_NUM_THREADS' or 'OMP_PROC_BIND' are defined and
     set to a list with more than one item, the maximum number of nested
     parallel regions will be initialized to the largest number
     supported, otherwise it will be set to one.

_See also_:
     *note omp_set_max_active_levels::, *note OMP_NESTED::

_Reference_:
     OpenMP specification v4.5 (https://www.openmp.org), Section 4.9