Exclude the openal package unless the lwjgl libraries are present.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3671 542714f4-19e9-0310-aa3c-eee0fc999fb1

tests/build.xml

@@ -23,6 +23,8 @@
 
   <!-- checks the availability of certain libraries -->
   <target name="check-available">
+    <available property="lwjgl.present"
+     classname="org.lwjgl.LWJGLException" classpathref="classpath"/>
     <available property="jme.present"
      classname="com.jme.scene.Node" classpathref="classpath"/>
     <available property="jme-bui.present"
@@ -33,6 +35,11 @@
         <isset property="jme-bui.present"/>
       </and>
     </condition>
+    <condition property="build.openal">
+      <and>
+        <isset property="lwjgl.present"/>
+      </and>
+    </condition>
   </target>
 
   <!-- generates additional methods for distributed object classes -->
@@ -102,6 +109,7 @@
       debug="on" optimize="off" deprecation="off">
       <classpath refid="classpath"/>
       <exclude name="com/threerings/jme/**" unless="build.jme"/>
+      <exclude name="com/threerings/openal/**" unless="build.openal"/>
     </javac>
   </target>