Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:tcl/openSUSE_Tumbleweed/devel:languages:tcl.repo
zypper refresh
zypper install tls
Для openSUSE Factory запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:tcl/openSUSE_Factory/devel:languages:tcl.repo
zypper refresh
zypper install tls
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:tcl/15.5/devel:languages:tcl.repo
zypper refresh
zypper install tls