Few questions about deploying on Linux and Windows

[Pufo]

About Windows:
In every tutorial about Windows deploy i see "nmake". It is necesary to install it ?
Even if i've used mingw to compile it ?

Also, how do i link to a .dll that has 150 MB ?
It will be necessary that the user would have the entire Qt SDK installed ?

About Linux:

If i compile it, it can't be run by others with the same type of distribution and CPU ?

As far as i know, compiled files are translated to CPU native language, so why would be necessary to include the source files for the user to compile them every time ?

The ideea is that i don't want to distribuite my source code.