CMake is required to build the FLINT from its source code on Windows. CMake is an open-source family of tools designed to build, test and package software.
Please download and install the latest binary distribution of CMake for your platform from here.
On opening the installer:
Open the installer, click Next.
Accept the terms and click Next.
Select the Add CMake to the system PATH for all users option in the Install options section.
Click Next and finally click Install
After CMake is installed, restart your system.