Source: meson Version: 0.45.0-1 Severity: serious meson build depends on openjdk-8-jdk, which is not expected to be part of the buster release.
If possible, this should be changed to default-jdk (this currently depends on openjdk-9-jdk). If a specific version has to be chosen, openjdk-11-jdk (already in unstable) is what will likely be shipped in the buster release.