Follow-up Comment #5, bug #18882 (project wesnoth):

zlib.h include for png_set_compression_level in libpng manual:
http://www.libpng.org/pub/png/libpng-manual.txt

"The png_set_compression_*() functions interface to the zlib compression
library, and should mostly be ignored unless you really know what you are
doing.  The only generally useful call is png_set_compression_level()
which changes how much time zlib spends on trying to compress the image
data.  See the Compression Library (zlib.h and algorithm.txt, distributed
with zlib) for details on the compression levels.

    #include zlib.h

    /* Set the zlib compression level */
    png_set_compression_level(png_ptr,
        Z_BEST_COMPRESSION);"

    _______________________________________________________

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