ComputationalRadiationPhysics/picongpu — pull request #338 by ax3l (2014-04-10 12:25:22+00:00)
Title: Require libpng 1.2.9+

... which provides `png_set_expand_gray_1_2_4_to_8` that will be required soon from PNGwriter in https://github.com/ax3l/pngwriter/issues/10