diff --git a/lib/observer/src/Makefile b/lib/observer/src/Makefile
index 2edb2ceb3e2d..716aa09e544d 100644
--- a/lib/observer/src/Makefile
+++ b/lib/observer/src/Makefile
@@ -128,7 +128,12 @@ ERL_COMPILE_FLAGS += \
 # ----------------------------------------------------
 # Targets
 # ----------------------------------------------------
-$(TYPES): $(TARGET_FILES)
+$(TYPES): env $(TARGET_FILES)
+
+env:
+	@which erlc
+	@which erl
+	$(ERL) -noshell -eval 'io:format("~p",[code:get_path()]).' -s init stop
 
 clean:
 	rm -f $(TARGET_FILES)