#error This file should be used only when compiling without charts.
#endif
+void
+chart_write_legend (struct chart *ch UNUSED)
+{
+}
+
+void
+chart_vector (struct chart *ch UNUSED, double x UNUSED, double y UNUSED)
+{
+}
+
+void
+chart_vector_end (struct chart *ch UNUSED)
+{
+}
+
+void
+chart_vector_start (struct chart *ch UNUSED, const char *name UNUSED)
+{
+}
+
void
chart_write_title (struct chart *chart UNUSED, const char *title UNUSED, ...)
{