Hello, There was a bug in libxml-security-c20 that case xmltooling to FTBFS on arm64 and maybel armel. This has been fixed in libxml-security-c20 2.0.2-3. Please give back xmltooling on arm64 and armel.
gb xmltooling_3.0.2-2 . arm64 armel -- Thanks, Feri