The packaging of Mesa graphics drivers has been significantly reworked, in particular: Applications linked against different Mesa versions than installed on the system should now work correctly going forward (however, applications against older Mesa, e.g. from Nixpkgs releases before 25.05, remain broken). The global Mesa version can now be managed without a mass rebuild by setting hardware.graphics.package. Packages that used to depend on Mesa for libgbm or libdri should use libgbm or dri-pkgconfig-stub as inputs, respectively. OpenSSH has been updated from 9.9p2 to 10.0p2, dropping support for DSA keys and adding a new ssh-auth binary to handle user authentication in a different address space from unauthenticated sessions.
Official announcement
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