Use dirty flag

Author: kulp

Makefile

@@ -25,7 +25,7 @@ M3US          = $(VARIANTS_MP3:%=%.m3u)
 ADDL_LYS      = $(filter EOGa%.ly,$(LYS))
 STD_LYS       = $(filter-out EOGa%.ly,$(LYS))
 
-GITREV := $(shell git describe --long --always --match="v*")
+GITREV := $(shell git describe --dirty --long --always --match="v*")
 
 HEADERS       = hymnnumber title poet composer meter tunename
 ADDL_HEADERS  = hymnnumber composer meter tunename