The _EnvGroebnerPairSelectionStrategy environment variable is ignored by this release of Maple.  In releases prior to Maple 11, it allowed the user to set the selection strategy of the Buchberger algorithm, which was used by the Groebner[Basis] and Groebner[Solve] commands.

Both commands now use the "normal" strategy exclusively, where applicable. The "sugar" strategy is not implemented and can not be used. The setting of _EnvGroebnerPairSelectionStrategy has no effect.

Keep in mind that newer algorithms (such as F4) outperform the Buchberger algorithm with any selection strategy. They are now used by default.  Additionally, Groebner[Solve] is much faster than in previous releases of Maple that used the sugar strategy.