This slipped through in PR #2327 and I noticed because the TechoBoard.h for my variant doesn't include the Wire header, so the source file in question does not coincidentally obtain a copy.
@@ -1,5 +1,7 @@
#include "EnvironmentSensorManager.h"
+#include <Wire.h>
+
#if ENV_PIN_SDA && ENV_PIN_SCL
#define TELEM_WIRE &Wire1 // Use Wire1 as the I2C bus for Environment Sensors
#else