2005.12.02 23:07 "Re: [Tiff] Determining installed version of libtiff", by Bob Friesenhahn
The tiffvers.h includes the version encoded as a string and a numeric constant. At the C API level you can call TIFFGetVersion() to return the version string.
TIFFGetVersion() returns a multiline string which pays homage to Sam Leffler and SGI. The fact that libtiff has been under new maintenance for a very long time should be reflected in the copyrights and the license. Sam Leffler and SGI can not be held responsible for the changes since libtiff left their hands.
It would be useful to have a way to obtain just the version string ("3.7.4").
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/