Fix build error on MacOSX

[pg-ito]

I fixed build error on MacOSX.
Please consider merge.

build-log comparison

• befor

"/path/to/Arduino/hardware/espressif/esp32/tools/esptool" --chip esp32 elf2image --flash_mode "dio" --flash_freq "80m" --flash_size "4MB" -o "/var/folders/XXXXXXXX/esp32_hello_world3.ino.bin" "/var/folders/XXXXXXXX/esp32_hello_world3.ino.elf"

• after

"/path/to/Arduino/hardware/espressif/esp32/tools/esptool.py" --chip esp32 elf2image --flash_mode "dio" --flash_freq "80m" --flash_size "4MB" -o "/var/folders/XXXXXXXX/esp32_hello_world3.ino.bin" "/var/folders/XXXXXXXX/esp32_hello_world3.ino.elf"

[me-no-dev]

it si correct. Did you run get.py?

[pg-ito]

Thanks your reply.
Yes, I run get.py.
I did it according to the following procedure.

https://github.com/espressif/arduino-esp32#instructions-for-mac

[me-no-dev]

you should have the esptool binary then ;) it should be there with the esptool.py and the rest.

[pg-ito]

I have esptool binary in the same directory of esptool.py.
But, esptool binary doesn't work...
(I'm using python 2.7.13)

Error loading Python lib '/var/folders/XX/XXXXXXXXXXXXXXXXXXXXX/T/_XXXXXXX/Python': dlopen(/var/folders/XX/XXXXXXXXXXXXXXXXXXXXX/T/_XXXXXXX/Python, 10): no suitable image found.  Did find:
	/var/folders/XX/XXXXXXXXXXXXXXXXXXXXX/T/_XXXXXXX/Python: code signature invalid for '/var/folders/XX/XXXXXXXXXXXXXXXXXXXXX/T/_XXXXXXX/Python'

[dibaggioj]

I'm also having the same error as @pg-ito is (#218).

After I tried @pg-ito's fix here, and made sure the pyserial was installed, the Arduino IDE successfully compiled my project.

[me-no-dev]

are you also running on older OSX than 10.12?

[dibaggioj]

@me-no-dev yes, I'm on MacOSX 10.10.5 and upgrading is not an option for me, unfortunately.

[me-no-dev]

@pg-ito give the esptool in this zip a go and report :)
esptool-mac-10.9.zip

[dibaggioj]

@me-no-dev that new esptool is working for me on MacOSX 10.10.5

[pg-ito]

I'm using MacOSX v.10.10.5（14F2109）on Mac mini (Late 2014).

Thanks for new esptool (^ ^)
I'll try it.