Using bitcoin-qt on Fedora, CentOS and Red Hat Enterprise Linux
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Berkeley DB
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On all platforms, including RHEL/CentOS/Fedora and the upstream build, bitcoin
uses Berkeley DB 4.8.
Oracle makes clear that binary compatibility is not guaranteed even between minor
releases of Berkeley DB. This has implications if you move your wallet to and
from a system with a different Berkeley DB version.

It is strongly recommended that if you change Berkeley DB versions you first
dump your wallet from the old system into a text file, and then import the
wallet into the new system.

To dump your wallet on the old system:

In the Bitcoin GUI, click the Help menu then select Debug Window. In the debug
window, click Console, and enter the command:

    dumpwallet path/to/filename.txt

Copy filename.txt from the old system to the new system, being aware that it
is not encrypted and taking appropriate precautions.

To import your wallet on the new system:

In the Bitcoin GUI, click the Help menu then select Debug Window. In the debug
window, click Console, and enter the command:

    importwallet path/to/filename.txt

Bitcoin will automatically begin rescanning the block chain after the import is
complete. The rescan will take several minutes, depending on the speed of the
system's CPU and hard drives.