Adding new board definitions to arduino 1.6

[tbowmo]

I'm trying to create a new board definition file for the micro board, so it's easier for others to compile things specifically to this board.

But It seems that I am missing something, as I keep getting the following error now:

sketch_feb24a.ino:1:21: fatal error: Arduino.h: No such file or directory 
compilation terminated.

(It's just the default empty sketch that I'm trying to compile)

I have created the following structure under my arduino folder

hardware\
->MySensors\
   ->avr\
      ->boards.txt
        platform.txt (copy from main arduino dir)
        programmers.txt (empty file)
        variants\
        ->Micro\
          ->pins_arduino.h

THe above was made partially with info from https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5---3rd-party-Hardware-specification

boards.txt contains the following
MySensorsMicro.name=MySensors Micro

 MySensorsMicro.upload.tool=arduino:avrdude
 MySensorsMicro.upload.protocol=arduino  
 MySensorsMicro.upload.maximum_size=30720
 MySensorsMicro.upload.maximum_data_size=2048
 MySensorsMicro.upload.speed=57600
 MySensorsMicro.bootloader.tool=arduino:avrdude
 MySensorsMicro.bootloader.unlock_bits=0x3F
 MySensorsMicro.bootloader.lock_bits=0x0F 
 MySensorsMicro.bootloader.low_fuses=0xFF 
 MySensorsMicro.bootloader.high_fuses=0xDA
 MySensorsMicro.bootloader.extended_fuses=0x05
 MySensorsMicro.bootloader.file=atmega/ATmegaBOOT_168_atmega328.hex
 
 MySensorsMicro.build.board=AVR_MICRO8
 MySensorsMicro.build.core=arduino  
 MySensorsMicro.build.variant=micro 
 MySensorsMicro.build.mcu=atmega328p
 MySensorsMicro.build.f_cpu=8000000L

However, it doesn't work at all.. As mentioned before, It can't find the arduino.h file, and I can't figure out why..

Is there anyone else that has a bit more knowledge about boards definition in the newest arduino 1.6, that could help out?