On 06/03/2014 01:00 PM, Vincent Belaïche wrote:
> dup2.c:35:0: warning: "WIN32_LEAN_AND_MEAN" redefined [enabled by default]
Why is your build trying to compile lib/dup2.c?  That appears to be the 
real bug here.  Emacs is supposed to supply its own dup2 on Microsoft 
Windows, and the build shouldn't try to compile the Gnulib dup2.c there.

> msvc-inval.h, given its naming, is probably a file from the MS Visual C
> compiler suite

No, it's from Gnulib.  It's a part of Gnulib that Emacs is not using.