I got a response from the author of libaqua. He asked me to verify whether
a GPLed library could indeed not be linked to POV-Ray without changing the
license. Is there anyone here, who knows enough about the license of
POV-Ray 3.6 to tell me, whether I am allowed to release  the source code
of my patch, if I am using a library released under GPL which in turn uses
FFTW and GSL (both also released under GPL)?

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