What do you want to license under the GPL? Some other software in the same package? Then it's "aggregate" (or "collective work"), not a derived work: it's ok to use incompatible licenses for these.
Early Creative Commons licenses have some wording issues that make them Debian-nonfree [0]: you might want to modify it and license your modified version under CC BY-SA 3.0 or 4.0 (see 4b in CC BY-SA 2.0). [0] https://wiki.debian.org/DFSGLicenses#Creative_Commons_Attribution_Share-Alike_.28CC-BY-SA.29_v3.0
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