Building with MSVC on Windows

The simplest is to use vcpkg as a package manager, which will give you access to libsndfile.

git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
.\bootstrap-vcpkg.bat
.\vcpkg integrate install
.\vcpkg integrate powershell

Assuming you want to build for x64, install the relevant packages as follows

.\vcpkg.exe install libsndfile:x64-windows-static benchmark:x64-windows-static

In the sfizz source directory, you can then build with CMake as usual, although you should clone the windows branch:

git clone --recursive https://github.com/sfztools/sfizz.git
cd sfizz
mkdir build
cd build
cmake .. -DSFIZZ_JACK=OFF "-DCMAKE_TOOLCHAIN_FILE=C:\Users\Paul\source\vcpkg\scripts\buildsystems\vcpkg.cmake" -DVCPKG_TARGET_TRIPLET=x64-windows-static
cmake --build . -j 16 --config Release

This builds the lv2 plugin in build\lv2\Release and the Turtle files in build\sfizz.lv2, but the installation procedure is not entirely automatic yet. You need to manually add lv2\Release\sfizz.dll to the build\sfizz.lv2 directory, and the the sfizz.lv2 directory to %APPDATA%\Roaming\LV2. Ardour should then find the plugin correctly and load it without issues.