On 02/09/2016 03:12 AM, Herbert J. Skuhra wrote:
> Checking for working stdalign.h fails with clang

This is due to a clang bug, which exposed a typo in the Gnulib code that 
was supposed to work around the clang bug. A patch to Gnulib is 
attached, and I've installed this in Gnulib and in the emacs-25 and 
master branches of the Emacs source. Please give it a try.