Describe: support compiling outside git checkout
 When building nmrpflash for Debian, there is no 'git' command available, and
 there is no '.git' directory either. This makes the build emit warnings from
 the $(shell) calls in VERSION variable in the Makefile and breaks the '-V'
 option.
 .
 The change in this patch accounts for missing 'git' command and resorts to
 using a STANDALONE_VERSION environment variable which in turn is provided by
 the package build mechanics.
 .
 This change has no effect when git command and the '.git' directory are
 available.
Author: Damyan Ivanov <dmn@debian.org>
https://github.com/jclehner/nmrpflash/pull/35

--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CC ?= gcc
 PREFIX ?= /usr/local
-VERSION = $(shell git describe --always | tail -c +2)
+VERSION := $(shell if [ -d .git ] && which git 2>&1 > /dev/null; then git describe --always | tail -c +2; else echo $$STANDALONE_VERSION; fi)
 LIBS = -lpcap
 CFLAGS += -Wall -g -DNMRPFLASH_VERSION=\"$(VERSION)\"
 LDFLAGS += $(LIBS)