For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Toolchains:MinGW:latest:win32/openSUSE_Tumbleweed/home:Ximi1970:Toolchains:MinGW:latest:win32.repo
zypper refresh
zypper install mingw32-pkgconf
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Toolchains:MinGW:latest:win32/15.4/home:Ximi1970:Toolchains:MinGW:latest:win32.repo
zypper refresh
zypper install mingw32-pkgconf