I noticed that GMime 3.2.14 unfortunately introduced an incompatible API change
Added a GNotifyDestroy to the GMimeParserOptions callback.
(<https://github.com/jstedfast/gmime/releases/tag/3.2.14>, <https://github.com/jstedfast/gmime/blob/141ce4a1925e9f6a4d95ac3d9cc9de5995913a02/gmime/gmime-parser-options.h#L131>) which will require *all* applications using this function to be changed. IOW, updating GMime to ≥ 3.2.14 is no solution. See also <https://github.com/jstedfast/gmime/issues/172>.
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