[macOS] Installing older version of NCNN (20210720) on Ventura

install-ncnn.sh

#!/bin/bash
# Install NCNN with OpenMP, OpenCV, Vulkan
# Reference: https://github.com/actions/runner-images/issues/5555#issuecomment-1133906879

## Install homebrew requirements
brew install libomp protobuf

## OpenCV 3.x is recommended for examples installation
brew install opencv@3
export PATH="/opt/homebrew/opt/opencv@3/bin:$PATH"

# Below are copied and modified slightly
# from: https://github.com/Tencent/ncnn/wiki/how-to-build#build-for-macos
## Install Vulkan SDK
wget https://sdk.lunarg.com/sdk/download/1.2.189.0/mac/vulkansdk-macos-1.2.189.0.dmg?Human=true -O vulkansdk-macos-1.2.189.0.dmg
hdiutil attach vulkansdk-macos-1.2.189.0.dmg
sudo /Volumes/vulkansdk-macos-1.2.189.0/InstallVulkan.app/Contents/MacOS/InstallVulkan --root `pwd`/vulkansdk-macos-1.2.189.0 --accept-licenses --default-answer --confirm-command install
hdiutil detach /Volumes/vulkansdk-macos-1.2.189.0
export VULKAN_SDK=`pwd`/vulkansdk-macos-1.2.189.0/macOS

## Build flag
cd <ncnn-root-dir>
mkdir -p build
cd build

### -DOpenMP... flags are mandatory,
### as cmake won't find libomp installed with homebrew.
cmake -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
    -DVulkan_INCLUDE_DIR="$VULKAN_SDK/MoltenVK/include" \
    -DVulkan_LIBRARY="$VULKAN_SDK/MoltenVK/dylib/macOS/libMoltenVK.dylib" \
    -DOpenMP_C_FLAGS="-Xclang -fopenmp -I/opt/homebrew/opt/libomp/include" \
    -DOpenMP_C_LIB_NAMES=libomp \
    -DOpenMP_CXX_FLAGS="-Xclang -fopenmp -I/opt/homebrew/opt/libomp/include" \
    -DOpenMP_CXX_LIB_NAMES=libomp \
    -DOpenMP_libomp_LIBRARY=/opt/homebrew/opt/libomp/lib/libomp.dylib \
    -DNCNN_VULKAN=ON -DNCNN_BUILD_EXAMPLES=ON ..

cmake --build . -j 3
cmake --build . --target install

Fixed OpenMP_libomp_LIBRARY which couldn't find libomp.dylib during linking.