Status of master mingw nss?

Trying a mingw cross build of current master on Fedora 17, it fails in 
module nss.  First problem should be fixable with

> diff --git a/nss/makefile.mk b/nss/makefile.mk
> index 8603fbb..ecd7e22 100644
> --- a/nss/makefile.mk
> +++ b/nss/makefile.mk
> @@ -134,8 +134,7 @@ BUILD_ACTION += NSS_USE_SYSTEM_SQLITE=1
>
>  PATCH_FILES+=nss.patch.mingw
>
> -moz_build:=$(shell cygpath -p $(MOZILLABUILD))
> -PATH!:=$(moz_build)/bin:$(PATH)
> +PATH!:=$(MOZILLABUILD)/bin:$(PATH)
>
>  nss_CC=$(CC)
>  nss_CXX=$(CXX)

but then application of nss.patch.mingw still fails.  --with-system-nss 
does not work for me either, as I have no idea which rpms (if available 
at all) I would need to install for that on Fedora 17.  And nss is 
apparently non-optional in our master builds these days.

Did anyone successfully build master mingw recently?

Stephan