How do I build Box2D with devkitARM's make?

[Missle Launch]

make[1]: arm-eabi-g++: Command not found

When I run make, when in Box2D's Source-folder, I get tons of those: every source-file listed in the makefile gets one. I have no idea, what so ever, as to what to do about this. I even have a copy of Pocket Physics, so I know that this is do-able. How is this library supposed to be built? I've asked the forum at Box2D, but I thought that asking here as well would be a good idea. In case it makes a difference; I'm trying to make a DS-game.