+/* these ones live in str.h, but redeclare them here so that we do
+ not need to load the whole str.h and its heavy dependencies */
+#ifndef __USE_GNU /* do not redeclare existing headers */
+XBT_PUBLIC(int) asprintf(char **ptr, const char *fmt, /*args */
+ ...) _XBT_GNUC_PRINTF(2, 3);
+XBT_PUBLIC(int) vasprintf(char **ptr, const char *fmt, va_list ap);
+#endif
+XBT_PUBLIC(char *) bprintf(const char *fmt, ...) _XBT_GNUC_PRINTF(1, 2);