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Create new new empty image using gimp with the same dimensions as your Blender frames
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Press CTRL+ALT+O to open blender frames as layers
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Press NAME to sort them by descending alphabetical order to have the layer show up in the right order
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Select first frame, hold SHIFT and select last frame and click Open
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Click File – Save as.. (or Save a Copy..) and choose a filename ending with .gif
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Click Save As Animation – Export and finally OK