make: make RIOT_VERSION fail-safe
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@ -65,7 +65,7 @@ include $(RIOTBASE)/Makefile.cflags
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# make the RIOT version available to the program
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ifeq ($(origin RIOT_VERSION), undefined)
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GIT_STRING := $(shell git describe --always --abbrev=4 --dirty=-`hostname`)
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GIT_STRING := $(shell git describe --always --abbrev=4 --dirty=-`hostname` 2> /dev/null)
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ifneq (,$(GIT_STRING))
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GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
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ifeq ($(strip $(GIT_BRANCH)),master)
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