From d37f6e1fbbdb52b170e61e82c845b944a7c38aaa Mon Sep 17 00:00:00 2001
From: Cody Boone Ferguson <53008573+xexyl@users.noreply.github.com>
Date: Thu, 6 Jul 2023 10:47:06 -0700
Subject: [PATCH] Add -lm to 2019/dogon/Makefile

Not all systems implicitly link in libm so this is necessary for those
systems.
---
 2019/dogon/Makefile | 2 +-
 thanks-for-fixes.md | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/2019/dogon/Makefile b/2019/dogon/Makefile
index e021c530d..2ec91e0a7 100644
--- a/2019/dogon/Makefile
+++ b/2019/dogon/Makefile
@@ -76,7 +76,7 @@ CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
 
 # Libraries needed to build
 #
-LIBS= -L ${X11_LIBDIR} -lX11
+LIBS= -L ${X11_LIBDIR} -lX11 -lm
 
 # C compiler to use
 #
diff --git a/thanks-for-fixes.md b/thanks-for-fixes.md
index 2f93ccc6d..b55851102 100644
--- a/thanks-for-fixes.md
+++ b/thanks-for-fixes.md
@@ -1349,6 +1349,11 @@ Cody made the author's statement that the entry compiles cleanly true by fixing
 versions of C` (in main()). Not strictly necessary but if he's making fixes he
 might as well.
 
+## [2019/dogon](2019/dogon/prog.c) ([README.md](2019/dogon/README.md))
+
+Cody added explicit linking of libm (`-lm`) for systems that do not do this
+(linux does not seem to but macOS does).
+
 
 ## [2019/karns](2019/karns/prog.c) ([README.md](2019/karns/README.md]))