我其实是想在windows上编译下最新的google protobuf，官方提供了vcpkg的方法来编译，一直报错，最后发现是这个问题：
如下图：
TIM图片20190716215655.png
C++ Installation - Windows
If you only need the protoc binary, you can download it from the release page:
https://github.com/protocolbuffers/protobuf/releases/latest
In the downloads section, download the zip file protoc-$VERSION-win32.zip. It contains the protoc binary as well as public proto files of protobuf library.
Protobuf and its dependencies can be installed directly by using vcpkg:
>vcpkg install protobuf protobuf:x64-windows
If zlib support is desired, you'll also need to install the zlib feature:
>vcpkg install protobuf[zlib] protobuf[zlib]:x64-windows
See https://github.com/Microsoft/vcpkg for more information.
To build from source using Microsoft Visual C++, see cmake/README.md.
To build from source using Cygwin or MinGW, follow the Unix installation instructions, above.
