where does revsecurity.dll comes from?

[Tiemo Hollmann TB]

Hello,

I am building the first time a standalone for a new stack on windows with LC
6.5.2.

The build process lasts unusual long (1-2 min) and after build I got a
"revsecurity.dll" in my standalone directoy.

I have never seen this dll before and don't find any unknown option in my
standalone settings, which could cause this dll.

Who can give me a hint, where this dll comes from and how I can get rid of
it - and hopefully speed up the build process?

Thanks

Tiemo