From fdc9e9840a7f13f5c3d8f54b25c6343dde5bb6b6 Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Sat, 5 Sep 2020 23:05:37 +0100
Subject: [PATCH] Makefile.m4: Fix rules to be parallel-make safe.

But unfortunately not portable beyond GNU Make.
---
 Makefile.m4 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Makefile.m4 b/Makefile.m4
index 0140fbc..e3db7b3 100644
--- a/Makefile.m4
+++ b/Makefile.m4
@@ -82,9 +82,11 @@ $(DVI) $(PDF): $(AUX) $(INS)
 .vpl.vf:; vptovf $<
 clean-local::; rm -rf t.*/
 
-$(ETX) $(MAP) $(INS): $(SRC) mdwfonts.ins
+$(wordlist 2,$(words $(ETX)),$(ETX)) $(MAP) $(INS): $(firstword $(ETX))
+$(firstword $(ETX)): $(SRC) mdwfonts.ins
 	tex "\nonstopmode \input mdwfonts.ins"
-$(FD) $(VF) $(PL) $(VPL): mdwfonts.tex $(ETX)
+$(wordlist 2,$(words $(FD)),$(FD)) $(VF) $(PL) $(VPL): $(firstword $(FD))
+$(firstword $(FD)): mdwfonts.tex $(ETX)
 	$(FONTINST) "\nonstopmode \input mdwfonts.tex"
 
 EXTRA_DIST = \
-- 
2.11.0