Merge from trunk.

diff --cc Makefile.in
Simple merge

diff --cc configure.ac
index d051514758409eaa5aed03a0cae9840a9fa07a79,39a0477a693b9684d243f8181a31ee10319cf4d1..4dfbc2243352cce24fada1760b6094f68846de96
--- 1/configure.ac
--- 2/configure.ac
+++ b/configure.ac
@@@ -812,18 -799,39 +812,49 @@@ dnl AC_PROG_MKDIR_
  dnl if test "x$RANLIB" = x; then
  dnl   AC_PROG_RANLIB
  dnl fi
- AC_PROG_LN_S
+ 
+ 
+ dnl Sadly, AC_PROG_LN_S is too restrictive.  It also tests whether links
+ dnl can be made to directories.  This is not relevant for our usage, and
+ dnl excludes some cases that work fine for us.  Eg MS Windows or files
+ dnl hosted on AFS, both examples where simple links work, but links to
+ dnl directories fail.  We use a cut-down version instead.
+ dnl AC_PROG_LN_S
+ 
+ AC_MSG_CHECKING([whether ln -s works for files in the same directory])
+ rm -f conf$$ conf$$.file
+ 
+ LN_S_FILEONLY='cp -p'
+ 
+ if (echo >conf$$.file) 2>/dev/null; then
+   if ln -s conf$$.file conf$$ 2>/dev/null; then
+     LN_S_FILEONLY='ln -s'
+   elif ln conf$$.file conf$$ 2>/dev/null; then
+     LN_S_FILEONLY=ln
+   fi
+ fi
+ 
+ rm -f conf$$ conf$$.file
+ 
+ if test "$LN_S_FILEONLY" = "ln -s"; then
+    AC_MSG_RESULT([yes])
+ else
+    AC_MSG_RESULT([no, using $LN_S_FILEONLY])
+ fi
+ 
+ AC_SUBST(LN_S_FILEONLY)
+ 
  
 +dnl AC_PROG_LN_S sets LN_S to 'cp -pR' for MinGW, on the premise that 'ln'
 +dnl doesn't support links to directories, as in "ln file dir".  But that
 +dnl use is non-portable, and OTOH MinGW wants to use hard links for Emacs
 +dnl executables at "make install" time.
 +dnl See http://lists.gnu.org/archive/html/emacs-devel/2013-04/msg00475.html
 +dnl for more details.
 +if test "$opsys" = "mingw32"; then
 +  LN_S="ln"
 +fi
 +
  AC_PATH_PROG(INSTALL_INFO, install-info, :,
    $PATH$PATH_SEPARATOR/usr/sbin$PATH_SEPARATOR/sbin)
  dnl Don't use GZIP, which is used by gzip for additional parameters.