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Failed to build.

+ exec meson setup --prefix /usr --libexecdir lib --sbindir bin --buildtype plain --auto-features enabled --wrap-mode nodownload -D b_lto=true -D b_pie=true ../waifu2x-w2xc --libdir /usr/lib/vapoursynth
The Meson build system
Version: 0.52.1
Source dir: /startdir/src/waifu2x-w2xc
Build dir: /startdir/src/build
Build type: native build
Project name: Waifu2x-w2xc
Project version: 8
Appending CXXFLAGS from environment: '-march=native -mtune=native -O2 -pipe -fstack-protector-strong -fno-plt'
Appending LDFLAGS from environment: ['-Wl,-O2,--sort-common,--as-needed,-z,relro,-z,now']
Appending CPPFLAGS from environment: '-D_FORTIFY_SOURCE=2'
Appending CXXFLAGS from environment: '-march=native -mtune=native -O2 -pipe -fstack-protector-strong -fno-plt'
Appending LDFLAGS from environment: ['-Wl,-O2,--sort-common,--as-needed,-z,relro,-z,now']
Appending CPPFLAGS from environment: '-D_FORTIFY_SOURCE=2'
C++ compiler for the host machine: c++ (gcc 9.2.0 "c++ (GCC) 9.2.0")
C++ linker for the host machine: GNU ld.bfd 2.33.1
Host machine cpu family: x86_64
Host machine cpu: x86_64
Found pkg-config: /usr/bin/pkg-config (1.6.3)
Run-time dependency vapoursynth found: YES 48
Library w2xc found: YES
Build targets in project: 1
Option buildtype is: plain [default: release]
Found ninja-1.9.0 at /usr/bin/ninja
[1/2] Compiling C++ object 'waifu2x-w2xc@sha/Waifu2x-w2xc_Waifu2x-w2xc.cpp.o'.
FAILED: waifu2x-w2xc@sha/Waifu2x-w2xc_Waifu2x-w2xc.cpp.o 
c++ -Iwaifu2x-w2xc@sha -I. -I../waifu2x-w2xc -I/usr/include/vapoursynth -fvisibility=hidden -flto -fdiagnostics-color=always -DNDEBUG -pipe -D_FILE_OFFSET_BITS=64 -std=c++14 -ffast-math -mfpmath=sse -msse2 -march=native -mtune=native -O2 -fstack-protector-strong -fno-plt -D_FORTIFY_SOURCE=2 -fPIC -MD -MQ 'waifu2x-w2xc@sha/Waifu2x-w2xc_Waifu2x-w2xc.cpp.o' -MF 'waifu2x-w2xc@sha/Waifu2x-w2xc_Waifu2x-w2xc.cpp.o.d' -o 'waifu2x-w2xc@sha/Waifu2x-w2xc_Waifu2x-w2xc.cpp.o' -c ../waifu2x-w2xc/Waifu2x-w2xc/Waifu2x-w2xc.cpp
../waifu2x-w2xc/Waifu2x-w2xc/Waifu2x-w2xc.cpp: In function \u2018bool filter(const VSFrameRef*, VSFrameRef*, Waifu2xData*, const VSAPI*)\u2019:
../waifu2x-w2xc/Waifu2x-w2xc/Waifu2x-w2xc.cpp:71:9: error: \u2018w2xconv_convert_rgb_f32\u2019 was not declared in this scope
   71 |     if (w2xconv_convert_rgb_f32(d->conv,
      |         ^~~~~~~~~~~~~~~~~~~~~~~
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in build().
    Aborting...

@yata that is better fill a issue in the bugtraker

https://github.com/HomeOfVapourSynthEvolution/VapourSynth-Waifu2x-w2xc/issues

I've been having issues building which lead to me editing /usr/include/w2xconv.h and removing line 31 '#include "tchar.h"' and replacing 'tchar' with 'char'. I was able to build after that.

==> Starting prepare()...
/path/to/vapoursynth-plugin-waifu2x-w2xc-git/PKGBUILD: line 30: ./autogen.sh: No such file or directory
==> ERROR: A failure occurred in prepare().
    Aborting...

Orphaned. Feel free to fix it.

missing DESTDIR in package()

Updated but it doesn't build here... Feel free to contribute or ask for (co)maintainership :)

upstream deleted configure file

should use autotools