mingw64-mman from home:PerryWerneck:mingw project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:PerryWerneck:mingw/openSUSE_Tumbleweed/home:PerryWerneck:mingw.repo zypper refresh zypper install mingw64-mman