Arkedo Series - 03 Pixel! [NPEB00615]

I cant test it because the emu does not work now. I need libpng it says, how and where should i install that now, there are no updates nowhere to be found about that

Reclone the submodules using git submodule update --init, since libpng has been added as a submodule for convenience.
After that you should be able to build just fine.