https://github.com/saitoha/libsixel/releases/tag/v1.8.4
https://github.com/saitoha/libsixel/blob/master/ChangeLog
https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037
https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad
https://github.com/saitoha/libsixel/issues/73
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