diff --git a/build b/build
index 80f62a3..d1241ae 100755
--- a/build
+++ b/build
@@ -29,7 +29,7 @@ cp -p ChangeLog $R/ChangeLog.txt
 # firmwares for more max channels
 for N in 3 8 6; do
     make clean
-    make CHANNELS=$N
+    make CHANNELS=$N || exit 2
     cp -p gt3b.s19 $R/gt3b-ch$N-$V.s19
     git add $R/gt3b-ch$N-$V.s19
 done
diff --git a/lcd.c b/lcd.c
index 0064aef..58ef7e8 100644
--- a/lcd.c
+++ b/lcd.c
@@ -700,7 +700,7 @@ void lcd_set_full_on(void) {
 
 _Bool lcd_bck_on;		// set when backlight ON
 u16   lcd_bck_count;		// counter in seconds
-u16   lcd_bck_seconds = 30;	// default number of backlight seconds
+u16   lcd_bck_seconds;		// default number of backlight seconds
 
 
 // set default ON seconds
@@ -719,6 +719,7 @@ void backlight_on_sec(u16 seconds) {
 
 // set on for default seconds
 void backlight_on(void) {
+    if (!lcd_bck_seconds)  return;	// nothing when not set
     backlight_on_sec(lcd_bck_seconds);
 }
 
diff --git a/main.c b/main.c
index 86647c1..979edaa 100644
--- a/main.c
+++ b/main.c
@@ -55,7 +55,7 @@ static void clock_init(void) {
 
 // copyright to firmware
 static u8 *copret(void) {
-    static const u8 *copyright = "(C) 2011 Pavel Semerad";
+    static const u8 copyright[] = "(C) 2011 Pavel Semerad";
     return copyright;
 }
 
diff --git a/menu.c b/menu.c
index 7277f66..7638caa 100644
--- a/menu.c
+++ b/menu.c
@@ -185,8 +185,8 @@ static void main_screen(u8 item) {
 	lcd_chars(cm.name);
     }
     else if (item == MS_BATTERY) {
-	static u16 bat_val = 0;
-	static u16 bat_time = 0;
+	static u16 bat_val;
+	static u16 bat_time;
 
 	// battery voltage
 	lcd_segment(LS_SYM_DOT, LS_ON);
@@ -592,7 +592,7 @@ static void menu_expo(void) {
 
 // set abs: OFF, SLO(6), NOR(4), FAS(3)
 // pulses between full brake and 1/2 brake and only when enought brake applied
-static const u8 *abs_labels[] = {
+static const u8 abs_labels[][4] = {
     "OFF", "SLO", "NOR", "FAS"
 };
 #define ABS_LABEL_SIZE  (sizeof(abs_labels) / sizeof(u8 *))
diff --git a/menu_key.c b/menu_key.c
index 11d2b07..7d2fd12 100644
--- a/menu_key.c
+++ b/menu_key.c
@@ -41,7 +41,7 @@
 #define TRIM_FUNCTIONS_SIZE  128
 @near static u8 trim_functions[TRIM_FUNCTIONS_SIZE];
 @near static u8 trim_functions_max;
-static const u8 *trim_buttons[] = {
+static const u8 trim_buttons[][4] = {
     "NOL", "RPT", "MOM", "RES", "END", "SPC"
 };
 #define TRIM_BUTTONS_SIZE  (sizeof(trim_buttons) / sizeof(u8 *))
diff --git a/menu_service.c b/menu_service.c
index a7eeb09..148a658 100644
--- a/menu_service.c
+++ b/menu_service.c
@@ -188,7 +188,7 @@ void menu_calibrate(void) {
 
 
 // key test menu
-static u8 *key_ids[] = {
+static const u8 key_ids[][4] = {
     "T1L", "T1R",
     "T2F", "T2B",
     "T3-", "T3+",
diff --git a/timer.c b/timer.c
index 9ea4853..2a2674d 100644
--- a/timer.c
+++ b/timer.c
@@ -27,7 +27,7 @@
 
 
 
-static u16 inactivity;
+static @near u16 inactivity;