@@ -1,7 +1,7 @@
 dnl -*- Autoconf -*-
-dnl Copyright (C) 1993-2008 Free Software Foundation, Inc.
+dnl Copyright (C) 1993-2002 Free Software Foundation, Inc.
 dnl This file is free software, distributed under the terms of the GNU
 dnl General Public License.  As a special exception to the GNU General
 dnl Public License, this file may be distributed as part of a program
 dnl that contains a configuration script generated by Autoconf, under
 dnl the same distribution terms as the rest of that program.
@@ -9,17 +9,18 @@
 dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
 
 AC_PREREQ(2.13)
 
 AC_DEFUN([CL_PROG_LN],
-[AC_CACHE_CHECK(how to make hard links, cl_cv_prog_LN, [
+[AC_REQUIRE([CL_PROG_CP])dnl
+AC_CACHE_CHECK(how to make hard links, cl_cv_prog_LN, [
 rm -f conftestdata conftestfile
 echo data > conftestfile
 if ln conftestfile conftestdata 2>/dev/null; then
   cl_cv_prog_LN=ln
 else
-  cl_cv_prog_LN="cp -p"
+  cl_cv_prog_LN="$cl_cv_prog_cp"
 fi
 rm -f conftestdata conftestfile
 ])
 LN="$cl_cv_prog_LN"
 AC_SUBST(LN)dnl
@@ -27,20 +28,60 @@
 
 AC_DEFUN([CL_PROG_LN_S],
 [AC_REQUIRE([CL_PROG_LN])dnl
 dnl Make a symlink if possible; otherwise try a hard link. On filesystems
 dnl which support neither symlink nor hard link, use a plain copy.
-AC_CACHE_CHECK([whether ln -s works], [cl_cv_prog_LN_S_works], [dnl
-rm -f conftestdata
-if ln -s X conftestdata 2>/dev/null; then
-  cl_cv_prog_LN_S_works=yes
-else
-  cl_cv_prog_LN_S_works=no
-fi
-rm -f conftestdata
-])
-if test $cl_cv_prog_LN_S_works = yes; then
-  LN_S="ln -s"
-else
-  LN_S="$cl_cv_prog_LN"
-fi
-AC_SUBST(LN_S)])
+AC_MSG_CHECKING(whether ln -s works)
+AC_CACHE_VAL(cl_cv_prog_LN_S, [
+rm -f conftestdata
+if ln -s X conftestdata 2>/dev/null; then
+  cl_cv_prog_LN_S="ln -s"
+else
+  cl_cv_prog_LN_S="$cl_cv_prog_LN"
+fi
+rm -f conftestdata
+])dnl
+if test "$cl_cv_prog_LN_S" = "ln -s"; then
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_RESULT(no)
+fi
+LN_S="$cl_cv_prog_LN_S"
+AC_SUBST(LN_S)dnl
+])
+
+AC_DEFUN([CL_PROG_HLN],
+[AC_REQUIRE([CL_PROG_LN_S])dnl
+dnl according to the Linux ln(1):
+dnl   "making a hard link to a symbolic link is not portable":
+dnl SVR4 (Solaris, Linux) create symbolic links
+dnl   (breaks when the target is relative)
+dnl Cygwin (1.3.12) is even worse: it makes hard links to the symbolic link,
+dnl   instead of resolving the symbolic link.
+dnl Good behavior means creating a hard link to the symbolic link's target.
+dnl To avoid this, use the "hln" program.
+AC_CACHE_CHECK(how to make hard links to symlinks, cl_cv_prog_hln, [
+cl_cv_prog_hln="ln"
+if test "$cl_cv_prog_LN_S" = "ln -s"; then
+echo "blabla" > conftest.x
+ln -s conftest.x conftest.y
+mkdir conftest.d
+cd conftest.d
+ln ../conftest.y conftest.z 2>&AC_FD_CC
+data=`cat conftest.z 2>/dev/null`
+if test "$data" = "blabla" ; then
+  # conftest.z contains the correct data -- good!
+  cl_cv_prog_hln="ln"
+else
+  # ln cannot link to symbolic links
+  cl_cv_prog_hln="hln"
+fi
+cd ..
+rm -fr conftest.*
+else
+# If there are no symbolic links, the problem cannot occur.
+cl_cv_prog_hln="ln"
+fi
+])
+HLN="$cl_cv_prog_hln"
+AC_SUBST(HLN)dnl
+])