Cannot build openjdk6 on Fbsd 8.1

[John R. Levine]

> java/openjdk6 WITH_WEB will give you the plugin to use with www/firefox.

I'm trying to build openjdk6, and I get this error message.  Any 
suggestions?

R's,
John

IcedTeaPluginUtils.cc IcedTeaScriptablePluginObject.cc
In file included from IcedTeaJavaRequestProcessor.h:46,
                  from IcedTeaJavaRequestProcessor.cc:41:
IcedTeaNPPlugin.h:43:27: error: nsThreadUtils.h: No such file or directory
In file included from IcedTeaJavaRequestProcessor.h:46,
                  from IcedTeaScriptablePluginObject.h:49,
                  from IcedTeaNPPlugin.cc:51:
IcedTeaNPPlugin.h:43:27: error: nsThreadUtils.h: No such file or directory
IcedTeaNPPlugin.cc:56:31: error: nsIPluginInstance.h: No such file or 
directory
IcedTeaNPPlugin.cc:57:35: error: nsIPluginInstancePeer.h: No such file or 
directory
IcedTeaNPPlugin.cc:58:31: error: nsIPluginTagInfo2.h: No such file or 
directory
IcedTeaNPPlugin.cc:62:30: error: nsICookieService.h: No such file or 
directory
IcedTeaNPPlugin.cc:63:26: error: nsIDNSRecord.h: No such file or directory
IcedTeaNPPlugin.cc:64:27: error: nsIDNSService.h: No such file or 
directory
IcedTeaNPPlugin.cc:65:24: error: nsINetUtil.h: No such file or directory
IcedTeaNPPlugin.cc:66:26: error: nsIProxyInfo.h: No such file or directory
IcedTeaNPPlugin.cc:67:37: error: nsIProtocolProxyService.h: No such file 
or directory
IcedTeaNPPlugin.cc:68:38: error: nsIScriptSecurityManager.h: No such file 
or directory
IcedTeaNPPlugin.cc:71:22: error: nsNetCID.h: No such file or directory
In file included from IcedTeaJavaRequestProcessor.h:46,
                  from IcedTeaScriptablePluginObject.h:49,
                  from IcedTeaPluginRequestProcessor.cc:41:
IcedTeaNPPlugin.h:43:27: error: nsThreadUtils.h: No such file or directory
In file included from IcedTeaPluginUtils.cc:39:
IcedTeaNPPlugin.h:43:27: error: nsThreadUtils.h: No such file or directory
In file included from IcedTeaJavaRequestProcessor.h:46,
                  from IcedTeaScriptablePluginObject.h:49,
                  from IcedTeaScriptablePluginObject.cc:41:
IcedTeaNPPlugin.h:43:27: error: nsThreadUtils.h: No such file or directory