For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:ownCloud:toolchains:mingw:win32:devel/openSUSE_Tumbleweed/isv:ownCloud:toolchains:mingw:win32:devel.repo
zypper refresh
zypper install mingw32-libqt5-qtbase
For openSUSE Leap 42.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:ownCloud:toolchains:mingw:win32:devel/openSUSE_Leap_42.1/isv:ownCloud:toolchains:mingw:win32:devel.repo
zypper refresh
zypper install mingw32-libqt5-qtbase
For openSUSE 13.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:ownCloud:toolchains:mingw:win32:devel/openSUSE_13.2/isv:ownCloud:toolchains:mingw:win32:devel.repo
zypper refresh
zypper install mingw32-libqt5-qtbase