wip makefil diff

Makefile

@@ -30,7 +30,8 @@ RESET    = "\e[0m"
 #               . name is case sensitive  . ?= set if not already set #
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
 
-D_QUINES  = ./1_Colleen
+D_QUINES  = ./1_Colleen \
+						./2_Grace
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
 #             .   target: prerequisites   .   $@ : target             #
@@ -44,6 +45,12 @@ all: $(D_QUINES)
 		$(MAKE) -C $$dir; \
 	done
 
+diff: $(D_QUINES)
+	@for dir in $^; do \
+		echo $(B_CYAN)"diff $$dir"$(RESET); \
+		$(MAKE) diff -C $$dir; \
+	done
+
 clean: $(D_QUINES)
 	@for dir in $^; do \
 		echo $(B_YELLOW)"clean $$dir"$(RESET); \