mingw32-cross-nsis from isv:ownCloud:toolchains:mingw:win32:2.3.3 project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 42.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:ownCloud:toolchains:mingw:win32:2.3.3/openSUSE_Leap_42.1/isv:ownCloud:toolchains:mingw:win32:2.3.3.repo zypper refresh zypper install mingw32-cross-nsis