diff --git a/README.md b/README.md
index 07ea9ff..1048f82 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,8 @@ If you want to deploy the code on a PI for production:
     $ pip install RPi.GPIO
 
 If you also want to use the in-kernel SPI drivers with a MAX31855 sensor:
-
+   
+    $ sudo apt-get install python-dev
     $ pip install Adafruit-MAX31855
 
 ## Configuration
diff --git a/lib/oven.py b/lib/oven.py
index ff17078..ce9dce2 100644
--- a/lib/oven.py
+++ b/lib/oven.py
@@ -21,12 +21,6 @@ try:
         from max31855spi import MAX31855SPI, MAX31855SPIError
         log.info("import MAX31855SPI")
         spi_reserved_gpio = [7, 8, 9, 10, 11]
-        if config.gpio_air in spi_reserved_gpio:
-            raise Exception("gpio_air pin %s collides with SPI pins %s" % (config.gpio_air, spi_reserved_gpio))
-        if config.gpio_cool in spi_reserved_gpio:
-            raise Exception("gpio_cool pin %s collides with SPI pins %s" % (config.gpio_cool, spi_reserved_gpio))
-        if config.gpio_door in spi_reserved_gpio:
-            raise Exception("gpio_door pin %s collides with SPI pins %s" % (config.gpio_door, spi_reserved_gpio))
         if config.gpio_heat in spi_reserved_gpio:
             raise Exception("gpio_heat pin %s collides with SPI pins %s" % (config.gpio_heat, spi_reserved_gpio))
     if config.max6675: