For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:forensics/openSUSE_Tumbleweed/security:forensics.repo
zypper refresh
zypper install libcthreads
For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:forensics/openSUSE_Factory_PowerPC/security:forensics.repo
zypper refresh
zypper install libcthreads
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:forensics/openSUSE_Factory_ARM/security:forensics.repo
zypper refresh
zypper install libcthreads
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:forensics/15.6/security:forensics.repo
zypper refresh
zypper install libcthreads
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:forensics/15.5/security:forensics.repo
zypper refresh
zypper install libcthreads