add './' to in example makefile, since . may not be included in PATH

examples/makefile

@@ -32,8 +32,8 @@ default:
 #	ruby auto/generate_test_runner.rb test/TestProductionCode2.c test/no_ruby/TestProductionCode2_Runner.c
 	$(C_COMPILER) $(INC_DIRS) $(SYMBOLS) $(SRC_FILES1) -o $(TARGET1)
 	$(C_COMPILER) $(INC_DIRS) $(SYMBOLS) $(SRC_FILES2) -o $(TARGET2)
-	$(TARGET1)
-	$(TARGET2)
+	./$(TARGET1)
+	./$(TARGET2)
 
 clean:
 	$(CLEANUP)