In new version libpng changed functions png_set_gray_1_2_4_to_8 and png_check_sig. File gfx/vsimage.cpp compiling with errors.
This bug (compilation fails with >=libpng-1.4) could be confirmed by a user here:
https://bugs.gentoo.org/show_bug.cgi?id=219559#c40
Please try and apply the patch submitted to the Gentoo bug tracker, it should at least fix the png_set_gray_1_2_4_to_8 problem and seems to be backwards compatible to libpng-1.2:
https://bugs.gentoo.org/attachment.cgi?id=231009&action=view
See also http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt for more changes.
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This bug (compilation fails with >=libpng-1.4) could be confirmed by a user here:
https://bugs.gentoo.org/show_bug.cgi?id=219559#c40
Please try and apply the patch submitted to the Gentoo bug tracker, it should at least fix the png_set_gray_1_2_4_to_8 problem and seems to be backwards compatible to libpng-1.2:
https://bugs.gentoo.org/attachment.cgi?id=231009&action=view
See also http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt for more changes.