Teensy 3.6 arrived this afternoon. I've never used one before, nor Arduino or any other such thing. I am a coder though, so I'm not completely clueless. Anyway:

- Plugged the little guy in, got the expected blinking LED

- I followed the instructions here to setup the IDE (on Mac): https://www.pjrc.com/teensy/td_download.html

- I selected Tools > Board > Teensy 3.6

- I selected File > Examples > Teensy > Tutorial1 > Blink (code below)

Code:
/* LED Blink, Teensyduino Tutorial #1
   http://www.pjrc.com/teensy/tutorial.html
 
   This example code is in the public domain.
*/

// Teensy 2.0 has the LED on pin 11
// Teensy++ 2.0 has the LED on pin 6
// Teensy 3.x / Teensy LC have the LED on pin 13
const int ledPin = 13;

// the setup() method runs once, when the sketch starts

void setup() {
  // initialize the digital pin as an output.
  pinMode(ledPin, OUTPUT);
}

// the loop() methor runs over and over again,
// as long as the board has power

void loop() {
  digitalWrite(ledPin, HIGH);   // set the LED on
  delay(1000);                  // wait for a second
  digitalWrite(ledPin, LOW);    // set the LED off
  delay(1000);                  // wait for a second
}
- I click "Verify", and the following error occurs during compilation:

Code:
In file included from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:34:0,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/wiring.h:38,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/WProgram.h:45,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/Arduino.h:6,
                 from /var/folders/3x/q25vfyxj7m3d0f7s33_by11hgpw8qd/T/arduino_build_968699/sketch/sketch_feb28a.ino.cpp:1:
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:764:12: error: operator '==' has no left operand
 #if (F_CPU == 256000000)
            ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:771:14: error: operator '==' has no left operand
 #elif (F_CPU == 240000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:779:14: error: operator '==' has no left operand
 #elif (F_CPU == 216000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:787:14: error: operator '==' has no left operand
 #elif (F_CPU == 192000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:795:14: error: operator '==' has no left operand
 #elif (F_CPU == 180000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:802:14: error: operator '==' has no left operand
 #elif (F_CPU == 168000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:806:14: error: operator '==' has no left operand
 #elif (F_CPU == 144000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:813:14: error: operator '==' has no left operand
 #elif (F_CPU == 120000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:820:14: error: operator '==' has no left operand
 #elif (F_CPU == 96000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:827:14: error: operator '==' has no left operand
 #elif (F_CPU == 72000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:834:14: error: operator '==' has no left operand
 #elif (F_CPU == 48000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:842:14: error: operator '==' has no left operand
 #elif (F_CPU == 24000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:846:14: error: operator '==' has no left operand
 #elif (F_CPU == 16000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:850:14: error: operator '==' has no left operand
 #elif (F_CPU == 8000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:854:14: error: operator '==' has no left operand
 #elif (F_CPU == 4000000)
              ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:858:14: error: operator '==' has no left operand
 #elif (F_CPU == 2000000)
              ^
In file included from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:34:0,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/wiring.h:38,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/WProgram.h:45,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/Arduino.h:6,
                 from /var/folders/3x/q25vfyxj7m3d0f7s33_by11hgpw8qd/T/arduino_build_968699/sketch/sketch_feb28a.ino.cpp:1:
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/kinetis.h:5736:41: error: operator '&&' has no right operand
 #if defined(HAS_KINETIS_HSRUN) && F_CPU > 120000000
                                         ^
In file included from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:35:0,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/wiring.h:38,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/WProgram.h:45,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/Arduino.h:6,
                 from /var/folders/3x/q25vfyxj7m3d0f7s33_by11hgpw8qd/T/arduino_build_968699/sketch/sketch_feb28a.ino.cpp:1:
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/pins_arduino.h:260:11: error: operator '>=' has no left operand
 #if F_CPU >= 20000000 && !defined(USB_DISABLED)
           ^
In file included from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/wiring.h:38:0,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/WProgram.h:45,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/Arduino.h:6,
                 from /var/folders/3x/q25vfyxj7m3d0f7s33_by11hgpw8qd/T/arduino_build_968699/sketch/sketch_feb28a.ino.cpp:1:
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2026:11: error: operator '==' has no left operand
 #if F_CPU == 256000000
           ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2028:13: error: operator '==' has no left operand
 #elif F_CPU == 240000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2030:13: error: operator '==' has no left operand
 #elif F_CPU == 216000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2032:13: error: operator '==' has no left operand
 #elif F_CPU == 192000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2034:13: error: operator '==' has no left operand
 #elif F_CPU == 180000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2036:13: error: operator '==' has no left operand
 #elif F_CPU == 168000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2038:13: error: operator '==' has no left operand
 #elif F_CPU == 144000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2040:13: error: operator '==' has no left operand
 #elif F_CPU == 120000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2042:13: error: operator '==' has no left operand
 #elif F_CPU == 96000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2044:13: error: operator '==' has no left operand
 #elif F_CPU == 72000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2046:13: error: operator '==' has no left operand
 #elif F_CPU == 48000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2048:13: error: operator '==' has no left operand
 #elif F_CPU == 24000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2050:13: error: operator '==' has no left operand
 #elif F_CPU == 16000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2052:13: error: operator '==' has no left operand
 #elif F_CPU == 8000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2054:13: error: operator '==' has no left operand
 #elif F_CPU == 4000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2056:13: error: operator '==' has no left operand
 #elif F_CPU == 2000000
             ^
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/core_pins.h:2063:11: error: operator '<' has no left operand
 #if F_CPU < 24000000
           ^
In file included from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/WProgram.h:54:0,
                 from /Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/Arduino.h:6,
                 from /var/folders/3x/q25vfyxj7m3d0f7s33_by11hgpw8qd/T/arduino_build_968699/sketch/sketch_feb28a.ino.cpp:1:
/Users/craig/Arduino.app/Contents/Java/hardware/teensy/avr/cores/teensy3/usb_serial.h:40:11: error: operator '>=' has no left operand
 #if F_CPU >= 20000000 && !defined(USB_DISABLED)
           ^
Error compiling for board Teensy 3.6.
I'm sure it's something silly and obvious, but this is all terra nueva to me...