Add "gpio" to the list of isp's that don't have a port

The gpio programmer type is used on the raspberry pi to upload using
the gpio spi pins via a sysfs interface, with a modified avrdude

Fix #165
Fix #166

1 files changed, 1 insertions, 1 deletions

diff --git a/Arduino.mk b/Arduino.mk
index 7c06094..02efc4b 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -1075,7 +1075,7 @@ endif
 
 AVRDUDE_ISP_OPTS = -c $(ISP_PROG) -b $(AVRDUDE_ISP_BAUDRATE)
 
-ifneq ($(strip $(ISP_PROG)),$(filter $(ISP_PROG), usbasp usbtiny))
+ifneq ($(strip $(ISP_PROG)),$(filter $(ISP_PROG), usbasp usbtiny gpio))
     AVRDUDE_ISP_OPTS += -P $(call get_isp_port)
 endif