mpfr from KDE:Unstable:Applications project
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Adicionar repositório e instalar manualmente
Para KDE Unstable Frameworks openSUSE Leap 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Unstable:Applications/KDE_Unstable_Frameworks_openSUSE_Leap_15.6/KDE:Unstable:Applications.repo zypper refresh zypper install mpfr