For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities:apertium/openSUSE_Tumbleweed/utilities:apertium.repo
zypper refresh
zypper install lttoolbox
For openSUSE 13.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities:apertium/openSUSE_13.2/utilities:apertium.repo
zypper refresh
zypper install lttoolbox
For openSUSE 13.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/utilities:apertium/openSUSE_13.1/utilities:apertium.repo
zypper refresh
zypper install lttoolbox