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rrdtool supports sql datasources if compiled against libdbi. To support this, libdbi-devel has to be added to the build reqirements.
Thanks for the report. I will try to address this also into f20.
rrdtool-1.4.8-8.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/rrdtool-1.4.8-8.fc20
rrdtool-1.4.8-8.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.