Hello, the unison source has wrong md5: ERROR: system/unison: Failed md5sum: unison-2.40.128.tar.gz actual md5sum is 4194015003956a10a2d0a83e3e7733f7 On the other hand, the slackbuild works as is with the version changed to 2.48.3 (which is the current version). Best regards, Alexander Verbovetsky