2018.11.04 20:20 "[Tiff] Libtiff will be released soon", by Bob Friesenhahn
Libtiff is on a path towards the next release. Please test the software (from https://gitlab.com/libtiff/libtiff) and make sure that no new issues have been added which impact you. It has been a year since the last release and if that duration is any indication, then it is worth your while to make sure that this next libtiff release is what it should be.
If there is something which should be included in libtiff prior to the release please lobby for it.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/