2010.06.21 20:21 "[Tiff] libtiff 3.9.X on AIX", by Bob Friesenhahn
It seems that libtiff 3.9.X is not all it should be on AIX. On this system, HAVE_INT32 is set to 1 in tiffconf.h. This might be fine if it was always true but apparently it is only true if <stdio.h> has been included. Libtiff HEAD uses a completely different strategy and does not rely on an OS type like 'int32' or 'uint32'.
There are reports that GraphicsMagick does not work properly with libtiff 3.9.4 on AIX.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/