diff --git a/configs/sam4s-xplained/src/sam_buttons.c b/configs/sam4s-xplained/src/sam_buttons.c
index 79a279e814c..56e523e19d4 100644
--- a/configs/sam4s-xplained/src/sam_buttons.c
+++ b/configs/sam4s-xplained/src/sam_buttons.c
@@ -61,7 +61,9 @@
  * Private Data
  ****************************************************************************/
 
+#if defined(CONFIG_SAM34_GPIOA_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
 static xcpt_t g_irqbp2;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/configs/viewtool-stm32f107/src/viewtool_stm32f107.h b/configs/viewtool-stm32f107/src/viewtool_stm32f107.h
index bd984ab1db9..9ee6eabdd59 100644
--- a/configs/viewtool-stm32f107/src/viewtool_stm32f107.h
+++ b/configs/viewtool-stm32f107/src/viewtool_stm32f107.h
@@ -301,6 +301,16 @@
 
 void weak_function stm32_spiinitialize(void);
 
+/****************************************************************************
+ * Name: stm32_ledinit
+ *
+ * Description:
+ *   Configure LEDs.  LEDs are left in the OFF state.
+ *
+ ****************************************************************************/
+
+void stm32_ledinit(void);
+
 /************************************************************************************
  * Name: stm32_usbdev_initialize
  *