From 20d08a2d0d4d3fdb5732341fd62243ac7bd44ae1 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Sun, 21 Jun 2020 15:02:22 -0700
Subject: Track system header dependencies

This change was meant to be included in d4297a13c8. Now that we use
-isystem to include header from other packages, we should make sure
those headers appear in the .d files.
---
 rules.ninja | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules.ninja b/rules.ninja
index 34f80a99..a44f88fb 100644
--- a/rules.ninja
+++ b/rules.ninja
@@ -4,13 +4,13 @@ rule gen
 
 # toolchain
 rule cc
-  command = $cc -MMD -MF $out.d $cflags -c -o $out $in
+  command = $cc -MD -MF $out.d $cflags -c -o $out $in
   depfile = $out.d
   deps = gcc
   description = 	CC	$out
 
 rule cpp
-  command = $cc -MMD -MF $out.d $cflags -E -P -o $out $in
+  command = $cc -MD -MF $out.d $cflags -E -P -o $out $in
   depfile = $out.d
   deps = gcc
   description = 	CPP	$out
-- 
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