Turns out bluefruit uses some of these macros even though "we" don't :-/

variants/t-echo/variant.h

@@ -48,7 +48,12 @@ extern "C" {
 #define PIN_LED2 (0 + 15) // 14 blue
 #define PIN_LED3 (0 + 13) // 15 green
 
-#define LED_BUILTIN PIN_LED1
+#define LED_RED PIN_LED3
+#define LED_BLUE PIN_LED1
+#define LED_GREEN PIN_LED2
+
+#define LED_BUILTIN LED_BLUE
+#define LED_CONN PIN_GREEN
 
 #define LED_STATE_ON 0 // State when LED is lit
 #define LED_INVERTED 1