From b743073dd14888990ca5a144e3b745ff9e4f4d84 Mon Sep 17 00:00:00 2001
From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Thu, 19 Apr 2018 11:44:03 -0400
Subject: [PATCH] Fix missing cleanup of "tree" executable

---
 exercises/ch01/Makefile | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/exercises/ch01/Makefile b/exercises/ch01/Makefile
index 3c986c0..d376e05 100644
--- a/exercises/ch01/Makefile
+++ b/exercises/ch01/Makefile
@@ -3,12 +3,14 @@ MAKEFLAGS := --no-builtin-rules
 OCAMLC_OPTIONS := -w A -warn-error A
 OCAMLC_BYTE    := ocamlc.opt   $(OCAMLC_OPTIONS)
 
-.PHONY: build clean demo_unbalanced
-
-build : \
+EXECUTABLES := \
 	straight_line_program_interpreter \
 	tree
 
+.PHONY: build clean demo_unbalanced
+
+build : $(EXECUTABLES)
+
 %: %.ml %.cmo %.cmi
 	$(OCAMLC_BYTE) -o $@ $*.cmo
 
@@ -19,7 +21,7 @@ build : \
 	$(OCAMLC_BYTE) -c $<
 
 clean:
-	rm -f straight_line_program_interpreter
+	rm -f $(EXECUTABLES)
 
 tree.png: tree
 	./tree a b c d e f g h i j k l m n o p q r s t u v foo bar kgkvbkvg lkhjlk gfjyfjf fdtrdchfhtr trhfgfch hjlilijhl iygkyugkgkhy | neato -T png > tree.png
-- 
2.20.1