yaml-cpp 0.9.0
=
https://github.com/jbeder/yaml-cpp/archive/refs/tags/yaml-cpp-0.9.0.tar.gz

``` sh *** build ***
cmake -B build \
  -DCMAKE_INSTALL_PREFIX=/pkg/gnu/yaml-cpp \
  -DCMAKE_BUILD_TYPE=Release \
  -DYAML_BUILD_SHARED_LIBS=OFF
cmake --build build -j$(nproc)
cmake --install build
```