Libwinpthread-1.dll dependency

[Korrion]

Hi,

I work with a qt 4.8.5 compiled statically on W7, I try now to remove all dependencies of my .exe.
First the last dll needed was libgcc_s_sjlj-1.dll, libstdc++-6.dll and libwinpthread-1.dll

So I added the following lines in my .pro
QMAKE_LFLAGS += -static-libgcc
QMAKE_LFLAGS += -static-libstdc++

But the .exe still needs libwinpthread-1.dll, what do i need to add in my .pro to remove this dependency ?

Thanks