which GnuRadio?

Hi,I successfully compiled and used Osmocom Tetra at its very first releases then left it aside for a while.I was now trying to rebuild it on my freshly reinstalled pc but I see it has not been updated to run on the current GR 3.7. Updating the "import" section was easy, but now I'm facing some errors (filter definitions in I reckon) beyond my expertise.Any hint on the most recent version of GR Osmocom-Tetra will run on?   Thanks Stefano