Hm, Ubuntu 12.04 ships with Qt version 4.8.1 and i'm for sure not fond
of replacing it by source compiled Qt version. What is the reason for
4.8.4 instead of > 4.8.0??
Bug fixing on the qt side, probably. The minimum version required by the code to compile succesfully is qt 4.6.2.
Bacula for Fedora/RHEL is patched this way to accept a lower version that is shipped in RHEL 6 as system libraries and works fine. We're lowering the requirement since June 2012 and so far we did not face any issue.
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