diff --git a/doc/docs.xml b/doc/docs.xml
index cb630912..6b56f351 100644
--- a/doc/docs.xml
+++ b/doc/docs.xml
@@ -76,7 +76,11 @@
 			the other libs required (depending on your configure
 			options). You should be able to see which extra packages
 			you need to install by reading errors that you get from
-			'./configure'.
+			'./configure'. You can enable/disable stuff by giving
+			options to configure, but be careful with disabling. For
+			example: with --disable-math you won't get errors but
+			logarithmic graphs will be normal graphs and gauges
+			will miss their line. 
 		</para>
 		<para>Conky has (for some time) been available in the
 			repositories of most popular distributions. Here are some
diff --git a/src/conky.c b/src/conky.c
index d15cd24e..4f84a3a9 100644
--- a/src/conky.c
+++ b/src/conky.c
@@ -6536,8 +6536,10 @@ static void draw_line(char *s)
 				{
 					int h, by = 0;
 					unsigned long last_colour = current_color;
+#ifdef MATH
 					float angle, px, py;
 					int usage;
+#endif /* MATH */
 
 					if (cur_x - text_start_x > maximum_width
 							&& maximum_width > 0) {
@@ -7388,12 +7390,12 @@ static void main_loop(void)
 				break;
 		}
 #ifdef HAVE_SYS_INOTIFY_H
-		if (inotify_fd != -1 && inotify_config_wd == -1) {
+		if (inotify_fd != -1 && inotify_config_wd == -1 && current_config != 0) {
 			inotify_config_wd = inotify_add_watch(inotify_fd,
 					current_config,
 					IN_MODIFY);
 		}
-		if (inotify_fd != -1 && inotify_config_wd != -1) {
+		if (inotify_fd != -1 && inotify_config_wd != -1 && current_config != 0) {
 			int len = 0, idx = 0;
 			fd_set descriptors;
 			struct timeval time_to_wait;
@@ -7583,6 +7585,7 @@ void clean_up(void)
 	}
 
 	free(current_config);
+	current_config = 0;
 
 #ifdef TCP_PORT_MONITOR
 	tcp_portmon_clear();
diff --git a/src/specials.c b/src/specials.c
index f8007d74..1a624483 100644
--- a/src/specials.c
+++ b/src/specials.c
@@ -254,11 +254,11 @@ static void graph_append(struct special_t *graph, double f, char showaslog)
 {
 	int i;
 
-#ifdef MATH
 	if (showaslog) {
+#ifdef MATH
 		f = log10(f + 1);
-	}
 #endif
+	}
 	
 	if (!graph->scaled && f > graph->graph_scale) {
 		f = graph->graph_scale;