cross-x86_64-gcc6 from openSUSE:Leap:42.2:Update project
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Add repository and install manually
For ports run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:42.2:Update/ports/openSUSE:Leap:42.2:Update.repo zypper refresh zypper install cross-x86_64-gcc6