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diff --git a/variants/gemma/pins_arduino.h b/variants/gemma/pins_arduino.h
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+/*
+  pins_arduino.c - pin definitions for the Arduino board
+  Part of Arduino / Wiring Lite
+
+  Copyright (c) 2005 David A. Mellis
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+
+  $Id: pins_arduino.c 565 2009-03-25 10:50:00Z dmellis $
+
+  Modified 28-08-2009 for attiny84 R.Wiersma
+  Modified 09-10-2009 for attiny45 A.Saporetti
+*/
+
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <avr/pgmspace.h>
+
+// Defines to make D4 support PWM
+// See for more info: http://forums.adafruit.com/viewtopic.php?f=52&t=43951
+//#define TCCR1A GTCCR
+//#define WGM10  PWM1B
+
+// ATMEL ATTINY45 / ARDUINO
+//
+//                  +-\/-+
+// Ain0 (D 5) PB5  1|    |8  Vcc
+// Ain3 (D 3) PB3  2|    |7  PB2 (D 2)  Ain1
+// Ain2 (D 4) PB4  3|    |6  PB1 (D 1) pwm1
+//            GND  4|    |5  PB0 (D 0) pwm0
+//                  +----+
+
+static const uint8_t A0 = 6;
+static const uint8_t A1 = 7;
+static const uint8_t A2 = 8;
+static const uint8_t A3 = 9;
+
+#define digitalPinToPCICR(p)    ( ((p) >= 0 && (p) <= 4) ? (&GIMSK) : ((uint8_t *)0) )
+#define digitalPinToPCICRbit(p) ( PCIE )
+#define digitalPinToPCMSK(p)    ( ((p) <= 4) ? (&PCMSK) : ((uint8_t *)0) )
+#define digitalPinToPCMSKbit(p) ( (p) )
+
+#define analogPinToChannel(p)   ( (p) < 6 ? (p) : (p) - 6 )
+
+#define TCCR1A GTCCR
+
+#ifdef ARDUINO_MAIN
+
+void initVariant()
+{
+	GTCCR |= (1 << PWM1B);
+}
+
+// these arrays map port names (e.g. port B) to the
+// appropriate addresses for various functions (e.g. reading
+// and writing) tiny45 only port B 
+const uint16_t PROGMEM port_to_mode_PGM[] = {
+	NOT_A_PORT,
+	NOT_A_PORT,
+	(uint16_t) &DDRB,
+};
+
+const uint16_t PROGMEM port_to_output_PGM[] = {
+	NOT_A_PORT,
+	NOT_A_PORT,
+	(uint16_t) &PORTB,
+};
+
+const uint16_t PROGMEM port_to_input_PGM[] = {
+	NOT_A_PIN,
+	NOT_A_PIN,
+	(uint16_t) &PINB,
+};
+
+const uint8_t PROGMEM digital_pin_to_port_PGM[] = {
+	PB, /* 0 */
+	PB,
+	PB,
+	PB,
+	PB, 
+	PB, // 5
+	PB, // A0
+	PB,
+	PB,
+	PB, // A4
+
+};
+
+const uint8_t PROGMEM digital_pin_to_bit_mask_PGM[] = {
+	_BV(0), /* 0, port B */
+	_BV(1),
+	_BV(2),
+	_BV(3), /* 3 port B */
+	_BV(4),
+	_BV(5),
+	_BV(5),
+	_BV(2),
+	_BV(4),
+	_BV(3),
+};
+
+const uint8_t PROGMEM digital_pin_to_timer_PGM[] = {
+	TIMER0A, /* OC0A */
+	TIMER0B,
+	NOT_ON_TIMER,
+	NOT_ON_TIMER,
+	TIMER1B,
+	NOT_ON_TIMER,
+	NOT_ON_TIMER,
+	NOT_ON_TIMER,
+	NOT_ON_TIMER,
+	NOT_ON_TIMER,
+};
+
+#endif
+
+#endif
+\ No newline at end of file