From 94306d5282c622df9c0507a7e61dc2676cfc94d1 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 14 Sep 2005 22:10:50 +0000
Subject: [PATCH] ($(calc_sources_generated)): Don't do anything if $@ exists. 
 This reverts part of the 2005-07-07 patch.

---
 examples/calc++/Makefile.am | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/examples/calc++/Makefile.am b/examples/calc++/Makefile.am
index 627b20c9..1456f2e7 100644
--- a/examples/calc++/Makefile.am
+++ b/examples/calc++/Makefile.am
@@ -62,8 +62,11 @@ $(srcdir)/calc++-parser.stamp: $(srcdir)/calc++-parser.yy $(BISON_IN)
 	@mv -f calc++-parser.tmp $@
 
 $(calc_sources_generated): $(srcdir)/calc++-parser.stamp
-	rm -f $(srcdir)/calc++-parser.stamp
-	$(MAKE) $(AM_MAKEFLAGS) $(srcdir)/calc++-parser.stamp
+	@if test -f $@; then :; else \
+	  rm -f $(srcdir)/calc++-parser.stamp && \
+	  $(MAKE) $(AM_MAKEFLAGS) $(srcdir)/calc++-parser.stamp; \
+	fi
+
 
 ## --------------------------- ##
 ## Building & testing calc++.  ##
-- 
2.47.2