libc++1 from home:alveus:KDE:Frameworks project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:alveus:KDE:Frameworks/openSUSE_Tumbleweed/home:alveus:KDE:Frameworks.repo zypper refresh zypper install libc++1