$NetBSD: patch-ae,v 1.9 2008/02/15 16:23:09 gdt Exp $

--- configure.in.orig	2007-06-06 19:22:24.000000000 -0400
+++ configure.in
@@ -1838,6 +1838,44 @@ if test "$DUMP" -a "$RESTORE"; then
 	AC_DEFINE(HAVE_HONOR_NODUMP,1,[Define this if dump accepts -h for honoring nodump. ])
       fi
     ])
+    AC_ARG_WITH(dump-use-snapshot,
+    [  --with-dump-use-snapshot  if dump supports -X, use it],
+    [ if test -x $DUMP; then
+        AC_CACHE_CHECK(
+	  [whether $DUMP supports -X (use filesystem snapshot)],
+	  amanda_cv_use_snapshot,
+	  [
+	    case "$DUMP" in
+	    *dump)
+		AC_TRY_COMMAND($DUMP 9Xf /dev/null /dev/null/invalid/fs 2>&1
+		    | $GREP -v Dumping
+		    | $GREP -v Date
+		    | $GREP -v Label >conftest.d-x 2>&1)
+		cat conftest.d-x >&AS_MESSAGE_LOG_FD()
+		AC_TRY_COMMAND($DUMP 9f /dev/null /dev/null/invalid/fs 2>&1
+		    | $GREP -v Dumping
+		    | $GREP -v Date
+		    | $GREP -v Label >conftest.d 2>&1)
+		cat conftest.d >&AS_MESSAGE_LOG_FD()
+		if AC_TRY_COMMAND(diff conftest.d-x conftest.d 1>&2); then
+		    amanda_cv_use_snapshot=yes
+		else
+		    amanda_cv_use_snapshot=no
+		fi
+		rm -f conftest.d conftest.d-x
+	      ;;
+	    *) amanda_cv_use_snapshot=no
+	      ;;
+	    esac
+	  ])
+      else
+	AC_MSG_WARN([*** $DUMP is not executable, cannot run -X test])
+	amanda_cv_use_snapshot=no
+      fi
+      if test "$amanda_cv_use_snapshot" = yes; then
+	AC_DEFINE(HAVE_DUMP_SNAPSHOT,1,[Define this if dump accepts -X for using snapshots. ])
+      fi
+    ])
 fi
 
 AC_PATH_PROGS(XFSDUMP,xfsdump,,$SYSLOCPATH)