diff --git a/os/common/ports/AVR/compilers/GCC/rules.mk b/os/common/ports/AVR/compilers/GCC/rules.mk
new file mode 100644
index 000000000..5dc726a62
--- /dev/null
+++ b/os/common/ports/AVR/compilers/GCC/rules.mk
@@ -0,0 +1,297 @@
+# AVR common makefile scripts and rules.
+
+##############################################################################
+# Processing options coming from the upper Makefile.
+#
+
+# Compiler options
+OPT    := $(USE_OPT)
+COPT   := $(USE_COPT)
+CPPOPT := $(USE_CPPOPT)
+
+# Output directory and files
+ifeq ($(BUILDDIR),)
+  BUILDDIR = build
+endif
+ifeq ($(BUILDDIR),.)
+  BUILDDIR = build
+endif
+OUTFILES := $(BUILDDIR)/$(PROJECT).elf \
+            $(BUILDDIR)/$(PROJECT).hex \
+            $(BUILDDIR)/$(PROJECT).bin \
+            $(BUILDDIR)/$(PROJECT).eep \
+            $(BUILDDIR)/$(PROJECT).lss \
+            $(BUILDDIR)/$(PROJECT).sym
+
+ifdef SREC
+  OUTFILES += $(BUILDDIR)/$(PROJECT).srec
+endif
+
+# Source files groups and paths
+ASRC      := $(CSRC) $(CPPSRC)
+SRCPATHS  := $(sort $(dir $(ASMXSRC)) $(dir $(ASMSRC)) $(dir $(ASRC)))
+
+# Various directories
+OBJDIR    := $(BUILDDIR)/obj
+LSTDIR    := $(BUILDDIR)/lst
+
+# Object files groups
+ACOBJS    := $(addprefix $(OBJDIR)/, $(notdir $(CSRC:.c=.o)))
+ACPPOBJS  := $(addprefix $(OBJDIR)/, $(notdir $(CPPSRC:.cpp=.o)))
+ASMOBJS   := $(addprefix $(OBJDIR)/, $(notdir $(ASMSRC:.s=.o)))
+ASMXOBJS  := $(addprefix $(OBJDIR)/, $(notdir $(ASMXSRC:.S=.o)))
+OBJS	  := $(ASMXOBJS) $(ASMOBJS) $(ACOBJS) $(ACPPOBJS)
+
+# Paths
+IINCDIR   := $(patsubst %, -I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
+LLIBDIR   := $(patsubst %, -L%,$(DLIBDIR) $(ULIBDIR))
+LLIBDIR   += -L$(dir $(LDSCRIPT))
+
+# Macros
+DEFS      := $(DDEFS) $(UDEFS)
+ADEFS 	  := $(DADEFS) $(UADEFS)
+
+# Libs
+LIBS      := $(DLIBS) $(ULIBS)
+
+# Compiler flag to set the C Standard level.
+#     c89   = "ANSI" C
+#     gnu89 = c89 plus GCC extensions
+#     c99   = ISO C99 standard (not yet fully implemented)
+#     gnu99 = c99 plus GCC extensions
+CSTANDARD = -std=gnu11
+
+# Place -D or -U options here for C sources
+CDEFS = -DF_CPU=$(F_CPU)UL
+
+# Place -D or -U options here for ASM sources
+ADEFS = -DF_CPU=$(F_CPU)
+
+# Place -D or -U options here for C++ sources
+CPPDEFS = -DF_CPU=$(F_CPU)UL
+
+# Paths where to search for sources
+VPATH     = $(SRCPATHS)
+
+# Various settings
+MCFLAGS := -mmcu=$(MCU)
+CFLAGS  = $(MCFLAGS) -I. -gdwarf-2 $(CDEFS) $(OPT) -funsigned-char
+CFLAGS  += -funsigned-bitfields -fpack-struct -fshort-enums $(CWARN)
+CFLAGS  += -Wa,-adhlns=$(LSTDIR)/$(notdir $(<:.c=.lst)) $(DEFS)
+CFLAGS  += -std=gnu11 -mrelax -fdata-sections -ffunction-sections
+CFLAGS  += -Wundef -MMD -MP #-MF
+
+#---------------- Assembler Options ----------------
+#  -Wa,...:   tell GCC to pass this to the assembler.
+#  -adhlns:   create listing
+#  -gstabs:   have the assembler create line number information; note that
+#             for use in COFF files, additional information about filenames
+#             and function names needs to be present in the assembler source
+#             files -- see avr-libc docs [FIXME: not yet described there]
+#  -listing-cont-lines: Sets the maximum number of continuation lines of hex
+#       dump that will be displayed for a given single line of source input.
+ASFLAGS = $(ADEFS) -Wa,-adhlns=$(<:%.S=$(OBJDIR)/%.lst),-gstabs, \
+          --listing-cont-lines=100
+
+#---------------- Library Options ----------------
+# Minimalistic printf version
+PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min
+
+# Floating point printf version (requires MATH_LIB = -lm below)
+PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt
+
+# If this is left blank, then it will use the Standard printf version.
+PRINTF_LIB = $(PRINTF_LIB_MIN)
+#PRINTF_LIB = $(PRINTF_LIB_MIN)
+#PRINTF_LIB = $(PRINTF_LIB_FLOAT)
+
+# Minimalistic scanf version
+SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min
+
+# Floating point + %[ scanf version (requires MATH_LIB = -lm below)
+SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt
+
+# If this is left blank, then it will use the Standard scanf version.
+SCANF_LIB = $(SCANF_LIB_MIN)
+#SCANF_LIB = $(SCANF_LIB_MIN)
+#SCANF_LIB = $(SCANF_LIB_FLOAT)
+
+MATH_LIB = -lm
+
+#---------------- Linker Options ----------------
+#  -Wl,...:     tell GCC to pass this to linker.
+#    -Map:      create map file
+#    --cref:    add cross reference to  map file
+
+#LDFLAGS = -Wl,-Map=$(TARGET).map,--cref,--gc-sections
+#LDFLAGS += $(EXTMEMOPTS)
+#LDFLAGS += $(patsubst %,-L%,$(EXTRALIBDIRS))
+#LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
+
+LDFLAGS = -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--gc-sections
+LDFLAGS += -Wl,-u,vfprintf -lprintf_min -Wl,-u,vfscanf -lscanf_min -lm
+
+#
+# Makefile rules
+#
+
+all: PRE_MAKE_ALL_RULE_HOOK $(OBJS) $(OUTFILES) POST_MAKE_ALL_RULE_HOOK
+
+PRE_MAKE_ALL_RULE_HOOK:
+
+POST_MAKE_ALL_RULE_HOOK:
+
+$(OBJS): | $(BUILDDIR) $(OBJDIR) $(LSTDIR)
+
+#$(BUILDDIR):
+#	@mkdir -p $(BUILDDIR)
+
+$(BUILDDIR):
+ifneq ($(USE_VERBOSE_COMPILE),yes)
+	@echo Compiler Options
+	@echo $(CC) -c $(CFLAGS) -I. $(IINCDIR) main.c -o main.o
+	@echo
+endif
+	@mkdir -p $(BUILDDIR)
+
+$(OBJDIR):
+	@mkdir -p $(OBJDIR)
+
+$(LSTDIR):
+	@mkdir -p $(LSTDIR)
+
+$(ACPPOBJS) : $(OBJDIR)/%.o : %.cpp Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(CPPC) -c $(CPPFLAGS) $(MOPT) $(IINCDIR) $< -o $@
+else
+	@echo Compiling $(<F)
+	@$(CPPC) -c $(CPPFLAGS) $(MOPT) $(IINCDIR) $< -o $@
+endif
+
+$(ACOBJS) : $(OBJDIR)/%.o : %.c  Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(CC) -c $(CFLAGS) $(MOPT) $(IINCDIR) $< -o $@
+else
+	@echo Compiling $(<F)
+	@$(CC) -c $(CFLAGS) $(MOPT) $(IINCDIR) $< -o $@
+endif
+
+$(ASMOBJS) : $(OBJDIR)/%.o : %.s Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(AS) -c $(ASFLAGS) -I. $(IINCDIR) $< -o $@
+else
+	@echo Compiling $(<F)
+	@$(AS) -c $(ASFLAGS) -I. $(IINCDIR) $< -o $@
+endif
+
+$(ASMXOBJS) : $(OBJDIR)/%.o : %.S Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(CC) -c $(ASXFLAGS) $(TOPT) -I. $(IINCDIR) $< -o $@
+else
+	@echo Compiling $(<F)
+	@$(CC) -c $(ASXFLAGS) $(TOPT) -I. $(IINCDIR) $< -o $@
+endif
+
+$(BUILDDIR)/$(PROJECT).elf: $(OBJS)
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(CC) $(CFLAGS) $^ --output $@ $(LDFLAGS)
+else
+	@echo Linking $@
+	@$(CC) $(CFLAGS) $^ --output $@ $(LDFLAGS)
+endif
+
+%.hex: %.elf
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(HEX) $< $@
+else
+	@echo Creating $@
+	@$(HEX) $< $@
+endif
+
+%.bin: %.elf
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(BIN) $< $@
+else
+	@echo Creating $@
+	@$(BIN) $< $@
+endif
+
+%.eep: %.elf
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	-$(CP) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	--change-section-lma .eeprom=0 --no-change-warnings -O $(FORMAT) \
+  $< $@ || exit 0
+else
+	@echo Creating $@
+	@-$(CP) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	--change-section-lma .eeprom=0 --no-change-warnings -O $(FORMAT) \
+  $< $@ || exit 0
+endif
+
+%.lss: %.elf
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(OD) -h -S $< > $@
+else
+	@echo Creating $@
+	@$(OD) -h -S $< > $@
+endif
+
+%.sym: %.elf
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(NM) -n $< > $@
+	$(SZ) $<
+	@echo
+	if test -f $(BUILDDIR)/$(PROJECT).elf; then echo; echo $(MSG_SIZE_AFTER); \
+	$(ELFSIZE); 2>/dev/null; echo; fi
+	@echo Done
+else
+	@echo Creating $@
+	@$(NM) -n $< > $@
+	@echo
+	@$(SZ) $<
+	@if test -f $(BUILDDIR)/$(PROJECT).elf; then echo; echo $(MSG_SIZE_AFTER); \
+	$(ELFSIZE); 2>/dev/null; echo; fi
+	@echo Done
+endif
+
+lib: $(OBJS) $(BUILDDIR)/lib$(PROJECT).a
+
+$(BUILDDIR)/lib$(PROJECT).a: $(OBJS)
+	@$(AR) -r $@ $^
+	@echo
+	@echo Done
+
+clean: CLEAN_RULE_HOOK
+	@echo Cleaning
+	-rm -fR .dep $(BUILDDIR)
+	@echo
+	@echo Done
+
+CLEAN_RULE_HOOK:
+
+#
+# Programming rules.
+#
+# TODO: Make this generic according tool used to program.(avr, bosac, etc...).
+program: $(BUILDDIR)/$(PROJECT).hex $(BUILDDIR)/$(PROJECT).eep
+	@echo
+	@echo Programming $(MCU) device.
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+	@echo Done
+
+#
+# Include the dependency files, should be the last of the makefile
+#
+-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)
+
+# *** EOF ***