From d44bf0ee722642252c4627aa0d81fa371152a53c Mon Sep 17 00:00:00 2001
From: Ralf Jung <jung@mpi-sws.org>
Date: Wed, 9 May 2018 19:22:01 +0200
Subject: [PATCH] fix make build-dep

---
 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index ebd91ff1a..e089b03f5 100644
--- a/Makefile
+++ b/Makefile
@@ -36,10 +36,10 @@ build-dep: build-dep/opam phony
 	@BUILD_DEP_PACKAGE="$$(egrep "^name:" build-dep/opam | sed 's/^name: *"\(.*\)" */\1/')"; \
 	  echo "# Pinning build-dep package." && \
 	  opam pin add -k path $(OPAMFLAGS) "$$BUILD_DEP_PACKAGE".dev build-dep && \
-	  (! opam --version | grep "^1\." > /dev/null) || ( \
+	  ((! opam --version | grep "^1\." > /dev/null) || ( \
 	    echo "# Reinstalling build-dep package." && \
 	    opam reinstall $(OPAMFLAGS) "$$BUILD_DEP_PACKAGE" \
-	  )
+	  ))
 
 # Some files that do *not* need to be forwarded to Makefile.coq
 Makefile: ;
-- 
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