The raspberry pi build is aimed at the pi 1 which uses an ARMv6 processor. The pi 2 uses an ARMv7 processor which has proved in practise to not be backwards compatible to the ARMv6 processors. So the pre-built pi build does not work on pi twos. The current recommendation is that you build the server yourself.
Edit: ARMv6 and v7 not v7 and v9.
Edit: ARMv6 and v7 not v7 and v9.