DOCS = tig.1.txt tig.1.html tig.1 README.html
ifneq (,$(wildcard .git))
-CFLAGS += '-DVERSION="$(shell git-describe)"'
+VERSION = $(shell git-describe)
+WTDIRTY = $(shell git-diff-index --name-only HEAD 2>/dev/null)
+CFLAGS += '-DVERSION="$(VERSION)$(if $(WTDIRTY),-dirty)"'
endif
all: $(PROGS)