I wonder if this is an issue in libgirepository1.0-dev ? According to [1], there is a generated dependency on libharfbuzz-gobject0 for sparc64 arch only.
[1] https://packages.debian.org/sid/gir1.2-harfbuzz-0.0 -- أحمد المحمودي (Ahmed El-Mahmoudy) Digital design engineer GPG KeyIDs: 4096R/A7EF5671 2048R/EDDDA1B7 GPG Fingerprints: 6E2E E4BB 72E2 F417 D066 6ABF 7B30 B496 A7EF 5761 8206 A196 2084 7E6D 0DF8 B176 BC19 6A94 EDDD A1B7
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