--- rxvt-unicode/configure.ac	2007/07/27 10:06:43	1.66
+++ rxvt-unicode/configure.ac	2007/07/31 18:13:26	1.67
@@ -471,7 +471,7 @@
   fi
   AC_MSG_CHECKING(for libAfterImage version >= 1.15)
   AFTERIMAGE_VERSION=`$afterimage_config --version`
-  if test -n $AFTERIMAGE_VERSION ; then
+  if test -n "$AFTERIMAGE_VERSION" ; then
     AFTERIMAGE_CFLAGS=`$afterimage_config --cflags`
     AFTERIMAGE_LIBS=`$afterimage_config --libs`
     if test "x$AFTERIMAGE_LIBS" != "x"; then