How to build the software:

[mjd@xiaomao git]$ git clone git://github.com/CapnKernel/playpause.git
Cloning into playpause...
remote: Counting objects: 130, done.
remote: Compressing objects: 100% (116/116), done.
remote: Total 130 (delta 70), reused 40 (delta 12)
Receiving objects: 100% (130/130), 89.68 KiB | 23 KiB/s, done.
Resolving deltas: 100% (70/70), done.
[mjd@xiaomao git]$ cd playpause/
[mjd@xiaomao playpause]$ git submodule init
Submodule 'src/vusb' (git://github.com/CapnKernel/vusb.git) registered for path 'src/vusb'
[mjd@xiaomao playpause]$ git submodule update
Cloning into src/vusb...
remote: Counting objects: 111, done.
remote: Compressing objects: 100% (72/72), done.
remote: Total 111 (delta 39), reused 111 (delta 39)
Receiving objects: 100% (111/111), 283.48 KiB | 102 KiB/s, done.
Resolving deltas: 100% (39/39), done.
Submodule path 'src/vusb': checked out '00ead0d1f280209ffc69095d6c5fee15398f69ad'
[mjd@xiaomao playpause]$ cd src
[mjd@xiaomao src]$ make hex
avr-gcc -Wall -Os -DF_CPU=16500000L  -Ivusb/usbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny85 -c vusb/usbdrv/usbdrv.c -o vusb/usbdrv/usbdrv.o
avr-gcc -Wall -Os -DF_CPU=16500000L  -Ivusb/usbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny85 -x assembler-with-cpp -c vusb/usbdrv/usbdrvasm.S -o vusb/usbdrv/usbdrvasm.o
avr-gcc -Wall -Os -DF_CPU=16500000L  -Ivusb/usbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny85 -c vusb/usbdrv/oddebug.c -o vusb/usbdrv/oddebug.o
avr-gcc -Wall -Os -DF_CPU=16500000L  -Ivusb/usbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny85 -c playpause.c -o playpause.o
avr-gcc -Wall -Os -DF_CPU=16500000L  -Ivusb/usbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny85 -o main.elf vusb/usbdrv/usbdrv.o vusb/usbdrv/usbdrvasm.o vusb/usbdrv/oddebug.o playpause.o -Wl,-Map=main.map,--cref
rm -f main.hex main.eep.hex
avr-objcopy -j .text -j .data -O ihex main.elf main.hex
avr-size main.hex
   text	   data	    bss	    dec	    hex	filename
      0	   2076	      0	   2076	    81c	main.hex
[mjd@xiaomao src]$ su
Password: 
[root@xiaomao src]# # Adjust the "avrisp2" and other parameters to suit your programmer
[root@xiaomao src]# avrdude -c avrisp2 -P usb -p attiny85 -q

avrdude: AVR device initialized and ready to accept instructions
avrdude: Device signature = 0x1e930b
avrdude: current erase-rewrite cycle count is -256 (if being tracked)

avrdude: safemode: Fuses OK

avrdude done.  Thank you.

[root@xiaomao src]# # For your programmer, try: make PROGRAMMER=usbtiny flash
[root@xiaomao src]# make flash
avrdude -c avrisp2 -P usb -p attiny85  -U flash:w:main.hex:i

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e930b
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: current erase-rewrite cycle count is -256 (if being tracked)
avrdude: erasing chip
avrdude: reading input file "main.hex"
avrdude: writing flash (2076 bytes):

Writing | ################################################## | 100% 0.73s

avrdude: 2076 bytes of flash written
avrdude: verifying flash memory against main.hex:
avrdude: load data flash data from input file main.hex:
avrdude: input file main.hex contains 2076 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.55s

avrdude: verifying ...
avrdude: 2076 bytes of flash verified

avrdude: safemode: Fuses OK

avrdude done.  Thank you.

[root@xiaomao src]#