Update GNUmakefile, port from bemanitools.

GNUmakefile

@@ -3,13 +3,18 @@ BUILDDIR        ?= build
 
 gitrev          := $(shell git rev-parse HEAD)
 
-all:
-# Generate a version file to identify the build
-	@echo "$(gitrev)" > version
+all: print-building
 
-.PHONY: clean
+.PHONY: clean print-building
+
+print-building:
+	@echo "Building gitrev "$(gitrev)"..."
 
 clean:
 	$(V)rm -rf $(BUILDDIR)
+	
+# Generate a version file to identify the build
+version:
+	@echo "$(gitrev)" > version
 
 include Module.mk