+XBT_LOG_EXTERNAL_CATEGORY(graphxml_parse);
+XBT_LOG_EXTERNAL_CATEGORY(log);
+XBT_LOG_EXTERNAL_CATEGORY(module);
+XBT_LOG_EXTERNAL_CATEGORY(peer);
+XBT_LOG_EXTERNAL_CATEGORY(strbuff);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_cfg);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_dict);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_dict_cursor);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_dict_elm);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_dict_multi);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_dyn);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_ex);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_fifo);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_graph);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_matrix);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_queue);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_set);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_sync_os);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_parmap);
+XBT_LOG_EXTERNAL_CATEGORY(xbt_parmap_unit);
+
+int _surf_do_model_check = 0; /* this variable is used accros the libraries, and must be declared in XBT so that it's also defined in GRAS (not only in libsimgrid) */
+
+/* Declare xbt_preinit and xbt_postexit as constructor/destructor of the library.
+ * This is crude and rather compiler-specific, unfortunately.
+ */
+static void xbt_preinit(void) _XBT_GNUC_CONSTRUCTOR;
+static void xbt_postexit(void) _XBT_GNUC_DESTRUCTOR;
+
+#ifdef _XBT_WIN32
+# undef _XBT_NEED_INIT_PRAGMA
+#endif
+
+#ifdef _XBT_NEED_INIT_PRAGMA
+#pragma init (xbt_preinit)
+#pragma fini (xbt_postexit)
+#endif
+
+#ifdef _XBT_WIN32
+#include <windows.h>
+
+/* Dummy prototype to make gcc happy */
+BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason,
+ LPVOID lpvReserved);