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The pngminus programs use several PNG image transformations: `png_set_expand`, `png_set_expand_1_2_4_to_8`, etc. (in png2pnm.c); `png_set_packing`, `png_set_invert_mono`, etc. (in pnm2png.c). The availability of all of these transformations in libpng is now required at compile time. On the topic of transformations, apply an unrelated fix to the use of `png_set_gamma`.
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".