Build waifu2x on macOS

waifu2x-build.sh

#!/usr/bin/env bash
# before running the script, make sure OpenCV has been installed through Homebrew
git clone https://github.com/DeadSix27/waifu2x-converter-cpp.git && cd waifu2x-converter-cpp
# caveat: libw2xc.dylib will be referenced by the executable using the build path, so you may want to copy the repo somewhere you eventually want the binaries to be
# latest working release is 5.3.4 (27ad20e6a2007d0415a7a1d7fc957e81395ab06b)
git checkout 27ad20e6a2007d0415a7a1d7fc957e81395ab06b
# create some temporary symbolic links, otherwise cmake and make will not find the files
ln -sf "${HOMEBREW_PREFIX}/opt/opencv/include/opencv4/opencv2" "${HOMEBREW_PREFIX}/opt/opencv/include/opencv2"
# run the next four lines only if you haven't installed LLVM through Homebrew
mkdir -p "${HOMEBREW_PREFIX}/opt/llvm/bin"
ln -sf "${HOMEBREW_PREFIX}/lib" "${HOMEBREW_PREFIX}/opt/llvm"
ln -sf /usr/bin/clang "${HOMEBREW_PREFIX}/opt/llvm/bin"
ln -sf /usr/bin/clang++ "${HOMEBREW_PREFIX}/opt/llvm/bin"
# cmake
cmake -DOVERRIDE_OPENCV=1 -DOPENCV_PREFIX="${HOMEBREW_PREFIX}/opt/opencv" .
# copying the models to ${HOMEBREW_PREFIX}/share
cp -r models_rgb "${HOMEBREW_PREFIX}/share/waifu2x-converter-cpp"
# namespace difference in Apple clang
sed -iE 's/std::filesystem/std::__fs::filesystem/g' src/modelHandler_OpenCL.cpp
# make the binary
make -j16
# if you don't want to keep the temporary symbolic links created earlier
rm -f "${HOMEBREW_PREFIX}/opt/opencv/include/opencv2"
# run the next line only if you haven't installed LLVM through Homebrew
rm -rf "${HOMEBREW_PREFIX}/opt/llvm"