--- a/vsearch_macros.xml	Thu Apr 14 01:23:59 2016 -0400
+++ b/vsearch_macros.xml	Fri Jan 20 03:38:56 2017 -0500
@@ -1,7 +1,7 @@
 <macros>
     <xml name="requirements">
         <requirements>
-            <requirement type="package" version="1.9.7">vsearch</requirement>
+            <requirement type="package" version="@VERSION@">vsearch</requirement>
         </requirements>
     </xml>
     <token name="@VERSION@">1.9.7</token>
@@ -159,19 +159,18 @@
     </xml>
 
     <xml name="general_output">
-        <param name="outputs" type="select" multiple="True" label="Select output files" help="">
+        <param name="outputs" type="select" multiple="True" optional="false" label="Select output files" help="">
             <option value="--alnout">Human-readable alignment output</option>
             <option value="--blast6out" selected="True">Blast-like tab-separated output</option>
             <option value="--fastapairs">Write query/target pairs of sequences</option>
             <yield/>
-            <validator type="no_options" message="Please select at least one output." />
         </param>
     </xml>
 
     <token name="@EXTERNAL_DOCUMENTATION@">
 <![CDATA[
 
-For details about this tool, please refer to the `github account <https://github.com/torognes/vsearch>`_ or the `vsearch manual <https://github.com/torognes/vsearch/raw/master/doc/vsearch_manual.pdf>`_.
+For details about this tool, please refer to the `GitHub repository <https://github.com/torognes/vsearch>`_ or the `vsearch manual <https://github.com/torognes/vsearch/releases/download/v1.9.7/vsearch_manual.pdf>`_.
 
 ]]>
     </token>