There are many cases in every cross-platform development framework that you want your source code to be built differently under different operating systems. For example you might want a method to to use platform specific functions in Windows, Linux and Mac OS X but you don’t want to have different projects for each one of them. If you are in a similar situation then you can use the following approach to have a single integrated project for all operating systems that you are developing for.
Another update on Picture Stamper. Now Mac OS X users can also download and use this tool for free! It’s not available in Mac App Store yet but hopefully it will, soon, and also in many other trusted download websites (just like Windows version).