# set default port depending on operating system
  OS := $(shell uname)
  ifeq ($(OS),Linux)
    PORT ?= $(PORT_LINUX)
  else ifeq ($(OS),Darwin)
    PORT ?= $(PORT_DARWIN)
  endif
  
  ifeq ($(PORT),)
      $(info Warning: no PORT set!)
  endif
  
  export BAUD ?= 115200
  export TERMFLAGS += -p "$(PORT)" -b "$(BAUD)"
  export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm
  
  export PORT