gcc >= 6.4
libprotoc >= 3.11.0
cmake >= 3.15.4
ninja >= 1.10.2
GCC can be found here, or if you have Homebrew, you can use brew install gcc. To check what version of gcc you have installed, run gcc --version.
The instructions to install libprotoc can be found here. Or alternatively, if you have Homebrew, you can run brew install protobuf. To check what version you have installed, run protoc --version.
Custom directions for installing protobuf under Windows are provided here.
Cmake can be found here. However, to use Cmake, you need to follow the "How to Install For Command Line Use" tutorial, which can be found in Cmake under Tools>How to Install For Command Line Use. To check which version you have, you can either look in the desktop version under CMake>About, or run cmake --version.
The instructions for installing Ninja can be found here. Or, using Homebrew, you can run brew install ninja. To check the version, run ninja --version.