Index: kscreensaver/configure.in.in
===================================================================
--- kscreensaver/configure.in.in	(revision 428301)
+++ kscreensaver/configure.in.in	(working copy)
@@ -36,33 +36,42 @@
 AM_CONDITIONAL(COMPILE_X11_KSAVERS, test "x$ac_x_includes" != x && test "x$ac_x_libraries" != x)
 AM_CONDITIONAL(COMPILE_ARTS_KSAVERS, test x$build_arts = xyes)
 
+AC_ARG_WITH(libart,
+  [AS_HELP_STRING(--with-libart,
+    [enable support for libart @<:@default=check@:>@])],
+  [], with_libart=check)
+
 LIBART=
+if test "x$with_libart" != xno; then
+  KDE_FIND_PATH(libart2-config, LIBART_CONFIG, [${prefix}/bin ${exec_prefix}/bin /usr/local/bin /opt/local/bin], [
+    AC_MSG_WARN([Could not find libart anywhere, check http://www.levien.com/libart/])
+  ])
 
-KDE_FIND_PATH(libart2-config, LIBART_CONFIG, [${prefix}/bin ${exec_prefix}/bin /usr/local/bin /opt/local/bin], [
-  AC_MSG_WARN([Could not find libart anywhere, check http://www.levien.com/libart/])
-])
-
-if test -n "$LIBART_CONFIG"; then
-  vers=`$LIBART_CONFIG --version 2>/dev/null | awk 'BEGIN { FS = "."; } { printf "%d", ($1 * 1000 + $2) * 1000 + $3;}'`
-  if test -n "$vers" && test "$vers" -ge 2003008
-  then
-     LIBART_LIBS="`$LIBART_CONFIG --libs`"
-     LIBART_RPATH=
-     for args in $LIBART_LIBS; do
+  if test -n "$LIBART_CONFIG"; then
+    vers=`$LIBART_CONFIG --version 2>/dev/null | awk 'BEGIN { FS = "."; } { printf "%d", ($1 * 1000 + $2) * 1000 + $3;}'`
+    if test -n "$vers" && test "$vers" -ge 2003008; then
+      LIBART_LIBS="`$LIBART_CONFIG --libs`"
+      LIBART_RPATH=
+      for args in $LIBART_LIBS; do
 	  case $args in
 	    -L*)
 	       LIBART_RPATH="$LIBART_RPATH $args"
 	       ;;
           esac
-     done
-     LIBART_RPATH=`echo $LIBART_RPATH | sed -e "s/-L/-R/g"`
-     LIBART_CFLAGS="`$LIBART_CONFIG --cflags`"
-     LIBART=yes
+      done
+      LIBART_RPATH=`echo $LIBART_RPATH | sed -e "s/-L/-R/g"`
+      LIBART_CFLAGS="`$LIBART_CONFIG --cflags`"
+      LIBART=yes
 
-     AC_DEFINE_UNQUOTED(HAVE_LIBART, 1, [Defines if your system has the libart library])
-  else
-     AC_MSG_WARN([You need at least libart 2.3.8])
+      AC_DEFINE_UNQUOTED(HAVE_LIBART, 1, [Defines if your system has the libart library])
+    else
+      AC_MSG_WARN([You need at least libart 2.3.8])
+    fi
   fi
+
+  if test "x$with_libart" != xcheck && test -z "$LIBART"; then
+      AC_MSG_FAILURE([--with-libart was given, but test for libart failed])
+  fi
 fi
 
 AC_SUBST(LIBART_LIBS)