diff -urN lftp-2.5.0a.org/m4/va_copy.m4 lftp-2.5.0a/m4/va_copy.m4
--- lftp-2.5.0a.org/m4/va_copy.m4	Thu Jan  1 01:00:00 1970
+++ lftp-2.5.0a/m4/va_copy.m4	Mon Mar  4 15:16:21 2002
@@ -0,0 +1,126 @@
+# Directly out of glib.  We don't do copy-by-value and other really
+# pessimistic tests, since just about all systems will have one of these.
+# Add them if needed.
+
+AC_DEFUN(lftp_VA_COPY,
+[
+   AC_CACHE_CHECK([for an implementation of va_copy()],lftp_cv_va_copy,[
+      AC_TRY_RUN([
+      #include <stdarg.h>
+      void f (int i, ...) {
+	 va_list args1, args2;
+	 va_start (args1, i);
+	 va_copy (args2, args1);
+	 if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+	    exit (1);
+	 va_end (args1); va_end (args2);
+      }
+      int main() {
+	 f (0, 42);
+	 return 0;
+      }],
+      [lftp_cv_va_copy=yes],
+      [lftp_cv_va_copy=no],
+      [])
+   ])
+   if test x$lftp_cv_va_copy != xyes; then
+      AC_CACHE_CHECK([for an implementation of __va_copy()],lftp_cv___va_copy,[
+	 AC_TRY_RUN([
+	 #include <stdarg.h>
+	 void f (int i, ...) {
+	    va_list args1, args2;
+	    va_start (args1, i);
+	    __va_copy (args2, args1);
+	    if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+	       exit (1);
+	    va_end (args1); va_end (args2);
+	 }
+	 int main() {
+	    f (0, 42);
+	    return 0;
+	 }],
+	 [lftp_cv___va_copy=yes],
+	 [lftp_cv___va_copy=no],
+	 [])
+      ])
+   fi
+
+   if test "x$lftp_cv_va_copy" = "xyes"; then
+	   va_copy_func=va_copy
+   elif test "x$lftp_cv___va_copy" = "xyes"; then
+	   va_copy_func=__va_copy
+   fi
+
+   if test -n "$va_copy_func"; then
+       AC_DEFINE_UNQUOTED(VA_COPY,$va_copy_func,[A 'va_copy' style function])
+
+   else
+
+      AC_CACHE_CHECK([whether va_lists can be copied by value],lftp_cv_va_val_copy,[
+	   AC_TRY_RUN([
+	   #include <stdarg.h>
+	   #include <string.h>
+	   void f (int i, ...) {
+	   va_list args1, args2;
+	   va_start (args1, i);
+
+	   memmove(&args2, &args1, sizeof(args1));
+	   if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+	     exit (1);
+	   va_end (args1); va_end (args2);
+	   }
+	   int main() {
+	     f (0, 42);
+	     return 0;
+	   }],
+	   [lftp_cv_va_val_copy=yes],
+	   [lftp_cv_va_val_copy=no],
+	   [lftp_cv_va_val_copy=no])
+      ])
+
+      if test x$lftp_cv_va_val_copy = xyes; then
+	 AC_DEFINE(VA_VAL_COPY,1,[Define to 1 if va_lists can be copied by value])
+      else
+	 AC_CACHE_CHECK([whether va_lists can be copied by pointer],lftp_cv_va_ptr_copy,[
+	      AC_TRY_RUN([
+	      #include <stdarg.h>
+	      void f (int i, ...) {
+	      va_list args1, args2;
+	      va_start (args1, i);
+
+	      *args2 = *args1;
+	      if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+		exit (1);
+	      va_end (args1); va_end (args2);
+	      }
+	      int main() {
+		f (0, 42);
+		return 0;
+	      }],
+	      [lftp_cv_va_ptr_copy=yes],
+	      [lftp_cv_va_ptr_copy=no],
+	      [lftp_cv_va_ptr_copy=no])
+	 ])
+
+	 if test x$lftp_cv_va_ptr_copy = xyes; then
+	    AC_DEFINE(VA_PTR_COPY,1,[Define to 1 if va_lists can be copied by pointer])
+	 fi
+      fi
+   fi
+
+   if test x$lftp_cv_va_val_copy != xyes -a x$lftp_cv_va_ptr_copy != xyes -a \
+           x$lftp_cv_va_copy != xyes -a x$lftp_cv___va_copy != xyes; then
+	   AC_MSG_ERROR(Can't find a way to va_copy.)
+   fi
+
+   dnl ZZZ for autoheader sorting.
+   AH_VERBATIM([VA_ZZZ_COPY],
+[#if !defined (VA_COPY)
+#  if defined (VA_PTR_COPY)
+#    define VA_COPY(ap1, ap2)   (*(ap1) = *(ap2))
+#  elif defined (VA_VAL_COPY)
+#    include <string.h>
+#    define VA_COPY(to,from) (memcpy(&(to),&(from),sizeof((to))))
+#  endif
+#endif /* !VA_COPY */])
+])