From 27d9154aa7ca0366cfbca51fce54eb7a1df775b8 Mon Sep 17 00:00:00 2001
From: Ralf Jung <jung@mpi-sws.org>
Date: Wed, 25 Apr 2018 11:53:25 +0200
Subject: [PATCH] fix Makefile

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

diff --git a/Makefile b/Makefile
index 0e955efec..ebd91ff1a 100644
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,7 @@ 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) "$$BUILD_DEP_PACKAGE".dev build-dep && \
-	  (! opam --version | grep "^1\.") || ( \
+	  (! opam --version | grep "^1\." > /dev/null) || ( \
 	    echo "# Reinstalling build-dep package." && \
 	    opam reinstall $(OPAMFLAGS) "$$BUILD_DEP_PACKAGE" \
 	  )
-- 
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