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[COPY] Copyright (C) 2004 - 2026 The T2 SDE Project
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[I] Portable Network Graphics (PNG) Reference Library

[T] PNG (Portable Network Graphics) is an extensible file format for the
[T] lossless, portable, well-compressed storage of raster images. PNG provides
[T] a patent-free replacement for GIF and can also replace many
[T] common uses of TIFF. Indexed-color, grayscale, and truecolor images are
[T] supported, plus an optional alpha channel. Sample depths range from
[T] 1 to 16 bits.

[U] http://www.libpng.org/

[A] Glenn Randers-Pehrson <randeg@alum.rpi.edu>
[M] René Rebe <rene@exactco.de>

[C] base/library
[F] CROSS

[L] OpenSource
[V] 1.6.55
[P] X ?----5---9 105.950

[D] 846b0c709a9b3d5604425a13c00691e72a854a040dc0009d53265dee libpng-1.6.55.tar.xz https://prdownloads.sourceforge.net/libpng/libpng16/
[D] e2cfc12dc7ddd49d6aada64471528fb1c2c53c61340bd6cfaa42db59 libpng-1.6.55-apng.patch.gz https://downloads.sourceforge.net/sourceforge/libpng-apng/

hook_add prepatch 5 'gzip -cd $(match_source_file -p *apng.patch.gz) | patch -p1'
hook_add postmake 5 "ln -sf libpng16/png.h $root$includedir/png.h"
hook_add postmake 5 "ln -sf libpng16/pngconf.h $root$includedir/pngconf.h"

#riscv/filter_rvv_intrinsics.c:37:18: error: invalid argument to built-in function
#   37 |       row_vals = __riscv_vadd_vv_u8m8(row_vals, prev_vals, vl);
var_append confopt ' ' --enable-riscv-rvv=no