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https://bugzilla.redhat.com/show_bug.cgi?id=700346
--- Comment #5 from Iain Arnell iarnell@gmail.com 2011-05-19 12:25:35 EDT --- Aha. It seems you also need to BuildRequire perl(GD).
And as it's technically optional, rpm won't automatically detect this as a runtime dependency either. But since the module seems pretty useless without being able to produce images, I would suggest adding an explicit Requires: perl(GD) to the spec file too.