From 302e7912253bd1f1a88f04d9a8a71d8a3c9b93fc Mon Sep 17 00:00:00 2001
From: Luca Ceresoli <luca@lucaceresoli.net>
Date: Sun, 3 May 2020 16:54:28 +0100
Subject: [PATCH] Build: fix parallelism problem.  Bug 2566

---
 src/OS/Makefile-Base | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/OS/Makefile-Base b/src/OS/Makefile-Base
index b66678bee..9eed7b0b9 100644
--- a/src/OS/Makefile-Base
+++ b/src/OS/Makefile-Base
@@ -662,11 +662,14 @@ PHDRS = ../config.h \
 .c.o:;  @echo "$(CC) $*.c"
 	$(FE)$(CC) -c $(CFLAGS) -I. $(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE) $*.c
 
-# Update Exim's version information and build the version object.
+# Update Exim's version information and build the version object.  The dependency
+# chain here avoids problems under parallel-make.
 
-version.h version.sh::
+version.sh:
 	@../scripts/reversion
 
+version.h: version.sh
+
 cnumber.h: version.h
 
 version.o: $(HDRS) cnumber.h version.h version.c
-- 
2.25.1