GCC 4.6.3 was released on 1 March 2012. Due to recent work on the gnat-aux package, it was relatively easy to update the pkgsrc version of gnat-aux to version 20120301 which syncs with GCC Release 4.6.3. It has already been tested and committed to the pkgsrc CVS trunk.
It wasn’t all sunshine and happy bananas though, as there was some trouble getting it to work properly with FreeBSD 9.x. The DragonLace people are on it though, and if things pan out as they usually do, they will have everything solved soon ™.
You can read the full post about the update here