Comment 3 for bug 561892

gcc (including 4.5) doesn't build against xulrunner-devel-1.9.2:

In file included from /usr/include/xulrunner-sdk-1.9.2/nsAString.h:43,
                 from /usr/include/xulrunner-sdk-1.9.2/nsSubstring.h:40,
                 from /usr/include/xulrunner-sdk-1.9.2/nsString.h:44,
                 from /usr/include/xulrunner-sdk-1.9.2/nsIPluginInstance.h:26,
                 from ../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:65:
/usr/include/xulrunner-sdk-1.9.2/nsStringFwd.h:49:2: error: #error Internal string headers are not available from external-linkage code.
In file included from /usr/include/xulrunner-sdk-1.9.2/nsAString.h:64,
                 from /usr/include/xulrunner-sdk-1.9.2/nsSubstring.h:40,
                 from /usr/include/xulrunner-sdk-1.9.2/nsString.h:44,
                 from /usr/include/xulrunner-sdk-1.9.2/nsIPluginInstance.h:26,
                 from ../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:65:
/usr/include/xulrunner-sdk-1.9.2/nsTSubstring.h:40:2: error: #error Cannot use internal string classes without MOZILLA_INTERNAL_API defined. Use the frozen header nsStringAPI.h instead.
In file included from /usr/include/xulrunner-sdk-1.9.2/nsAString.h:69,
                 from /usr/include/xulrunner-sdk-1.9.2/nsSubstring.h:40,
                 from /usr/include/xulrunner-sdk-1.9.2/nsString.h:44,
                 from /usr/include/xulrunner-sdk-1.9.2/nsIPluginInstance.h:26,
                 from ../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:65:
/usr/include/xulrunner-sdk-1.9.2/nsTSubstring.h:40:2: error: #error Cannot use internal string classes without MOZILLA_INTERNAL_API defined. Use the frozen header nsStringAPI.h instead.
In file included from /usr/include/xulrunner-sdk-1.9.2/nsReadableUtils.h:51,
                 from /usr/include/xulrunner-sdk-1.9.2/nsString.h:52,
                 from /usr/include/xulrunner-sdk-1.9.2/nsIPluginInstance.h:26,
                 from ../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:65:
/usr/include/xulrunner-sdk-1.9.2/nsTArray.h:46:15: error: new: No such file or directory
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:66:35: error: nsIPluginInstancePeer.h: No such file or directory
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:67:31: error: nsIPluginTagInfo2.h: No such file or directory
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:149: error: 'NS_IPLUGINTAGINFO2_IID' was not declared in this scope
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:207: error: ISO C++ forbids declaration of 'nsIPluginTagInfo2' with no type
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:207: error: expected ';' before '*' token
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc: In function 'gchar* plugin_get_documentbase(NPP_t*)':
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:877: error: 'nsIPluginInstancePeer' was not declared in this scope
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:877: error: 'peer' was not declared in this scope
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:879: error: 'nsIPluginTagInfo2' was not declared in this scope
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:879: error: 'pluginTagInfo2' was not declared in this scope
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:891: error: 'class nsIPluginInstance' has no member named 'GetPeer'
../../../../../../libjava/classpath/native/plugin/gcjwebplugin.cc:898: error: 'union info_union' has no member named 'info_field'

Google found http://icedtea.classpath.org/hg/icedtea6?cmd=changeset;node=8353f4e67ec1 changes to IcedTea plugin, perhaps those might be usable to some extent. This is a blocker for gcc in f13..