title: Error when compiling nettle-2.7.1
body: <p>When I try to compile nettle-2.7.1, I get the following:</p>
  
  <p>root@tcx2270-19:~/nettle-2.7.1# make
  make: Warning: Can't find <code>aes-decrypt-internal.o.d': No such file or directory
  make: Fatal error in reader: Makefile, line 594: Read of include file</code>aes-decrypt-internal.o.d' failed</p>
  
  <p>Has anyone seen this issue?  Thanks.</p>