Karl told me to do it!

freeswitch/autoload_configs/http_cache.conf.xml

@@ -1,7 +1,7 @@
 <configuration name="http_cache.conf" description="HTTP GET cache">
   <settings>
     <param name="max-urls" value="10000"/>
-    <param name="location" value="$${base_dir}/share/freeswitch/http_cache"/>
+    <param name="location" value="$${sounds_dir}/http_cache"/>
     <param name="default-max-age" value="86400"/>
     <param name="prefetch-thread-count" value="8"/>
     <param name="prefetch-queue-size" value="100"/>