From e7671486aca402b6e85cc9b200263fde16ebbb9b Mon Sep 17 00:00:00 2001
From: John Tumminaro <john@tumminaro.com>
Date: Wed, 16 Sep 2026 11:09:33 -0600
Subject: [PATCH] src/Makefile: build lib before the other directories so make
 -jN works

Every directory except lib links ../lib/libcom.a, but the top-level
Makefile declared no dependency between the sub-directory targets, so a
parallel top-level build (make -j8) started them all at once and utils,
orbit, tedit, lsq, redig and arsig failed with "No rule to make target
../lib/libcom.a". install.sh runs a serial make and was not affected.

Declaring that every other directory depends on lib restores the ordering
while keeping the per-directory builds parallel. Verified with a clean
make -j8 on Ubuntu 24.04 (gfortran 13) and on macOS (Darwin 27, Homebrew
gfortran 16): all 11 executables build.
---
 src/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Makefile b/src/Makefile
index b8406bf..fd5e375 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -6,6 +6,10 @@ all : $(SUBDIR)
 $(SUBDIR) :
 	make -j4 -C $@
 
+# Every other directory links ../lib/libcom.a, so a parallel top-level make
+# (make -jN) must finish lib first.
+$(filter-out lib,$(SUBDIR)) : lib
+
 install :
 	@mkdir -p ../bin/
 	mv arsig/arsig lsq/lsq tedit/tedit redig/redig orbit/sp3orb spp/spp otl/otl mhm/mhm \