From 6385b54757de0dc0194d691e668395e09d6e5868 Mon Sep 17 00:00:00 2001
From: Ralf Jung <jung@mpi-sws.org>
Date: Wed, 11 Nov 2020 18:47:30 +0100
Subject: [PATCH] update Makefile

---
 Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 9f262326..ac8dba01 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,8 @@ phony: ;
 
 clean: Makefile.coq
 	+@$(MAKE) -f Makefile.coq clean
-	find theories tests exercises solutions \( -name "*.d" -o -name "*.vo" -o -name "*.vo[sk]" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete || true
+	@# Make sure not to enter the `_opam` folder.
+	find [a-z]*/ \( -name "*.d" -o -name "*.vo" -o -name "*.vo[sk]" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete || true
 	rm -f Makefile.coq .lia.cache builddep/*
 .PHONY: clean
 
-- 
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