Not a very  common way to transpose into the Fianchetto Pirc, although the likes of  Kramnik, Aronian and Ivanchuk exploit it quite often.
1. d2d4  1... g8f6  2. g1f3  2... g7g6  3. g2g3  3... f8g7  4. f1g2  4... e8g8  5. e1g1  5... d7d6 