Create N900 app in Qt under Windows 7

[wysota]

I'm telling you that on my project I must have the staticlib plugin .dll on zlib folder in order for zlib plugin to compile without erros because it uses some dependencies from the staticlib plugin.

1) Static library and dll are two completely different things (dll means "dynamically loaded library").
2) Static libraries are not plugins.
3) It doesn't have to be in the folder you say. You can tell your compiler where to look for libraries.
4) DLLDESTDIR says where a dynamic library you build will be placed. It says nothing about (and doesn't affect) static libraries.

What is false about your second statement is that you assume something has to be somewhere and not that it affects or doesn't affect anything. If you need to link against some library then tell the component that needs it where to find it instead of copying it around, having multiple instances and never knowing which is which. The whole point of a library is that you have one copy of it. Otherwise you can just include its source files directly in each component that needs the functionality.