For openSUSE 13.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/OBS:Server:2.5/openSUSE_13.2/OBS:Server:2.5.repo
zypper refresh
zypper install rubygem-rake-compiler
For openSUSE 13.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/OBS:Server:2.5/openSUSE_13.1/OBS:Server:2.5.repo
zypper refresh
zypper install rubygem-rake-compiler
For openSUSE 12.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/OBS:Server:2.5/openSUSE_12.3/OBS:Server:2.5.repo
zypper refresh
zypper install rubygem-rake-compiler
For openSUSE 12.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/OBS:Server:2.5/openSUSE_12.2/OBS:Server:2.5.repo
zypper refresh
zypper install rubygem-rake-compiler