2009.05.17 16:44 "Re: [Tiff] Potential problem in libtiff when compiled in MinGW", by Bob Friesenhahn
i.e., %ll does not work but %I64 works in MinGW. This is because MinGW uses msvcrt.dll, which is Microsoft, which.. see for example http://ascending.wordpress.com/2008/04/22/long-long-on-windows-dev-c-mingw/
I see. MinGW depends on whatever library happens to be installed so %ll may work on some Windows systems (which happen to have an updated library) and not on others.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/