c++ stacked bar graph

[dhouse]

I am looking for a free, light weight c++ library that can create stacked bar graphs / histograms and output them as an image file (PNG would be preferrable).

Any help would be greatly appreciated.
--dhouse

[tabstop]

If you're willing to swap out "light weight c++ library" for "stand-alone program that can run from script files", you can check out gnuplot.