GJS_REGISTER_NATIVE_MODULE_WITH_FLAGS (in gjs/native.h)
defines shared objects initialization routines using GNU C specific annotation.
When running gjs compiled with Sun's compiler native modules cannot register 
as the __attribute__((constructor)) is ignored.

Please find below a patch to fix this problem.

--- gjs-0.7/gjs/native.h        2010-04-18 02:55:15.000000000 +0200
+++ gjs-0.7-sunpro/gjs/native.h 2010-05-26 14:29:17.761796993 +0200
@@ -65,8 +65,18 @@
 typedef JSBool (* GjsDefineModuleFunc) (JSContext *context,
                                         JSObject  *module_obj);
 
+#ifdef __GNUC__
+#define INIT __attribute__((constructor))
+#elif __SUNPRO_C
+#define Pragma(x) _Pragma(#x)
+#define INIT Pragma(init(register_native_module))
+#else
+Initialization routine in a dynamic object not defined for current compiler
+#endif
+
 #define GJS_REGISTER_NATIVE_MODULE_WITH_FLAGS(module_id_string, module_func, flags) \
-    __attribute__((constructor)) static void                                 \
+    INIT                                            \
+    static void                                                                     \
     register_native_module (void)                                            \
     {                                                                        \
         gjs_register_native_module(module_id_string, module_func, flags); \