From 1982b8ef05ecf839a82792866c21219feb8fa7cc Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Thu, 4 Jan 2024 16:28:29 -0500
Subject: Compile as c99, link math lib, preparing for FP exceptions.

---
 Makefile | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index a937a0d..441321e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,9 @@
 # Makefile for hcalc. Requires GNU make.
 
-# Users and packagers, feel free to override these:
+# Users and packagers, feel free to override these.
+# Do not override CFLAGS! Use COPT instead.
 CC = gcc
-CFLAGS = -Wall -g
+COPT =
 LIBS =
 DESTDIR =
 PREFIX = /usr
@@ -33,6 +34,11 @@ GZIP = gzip
 # - realclean is a maintainer-only target, deletes generated files that are
 #   in git.
 
+# -D_POSIX_C_SOURCE needed for fileno(), when using -std=c99
+#CFLAGS = -Wall -g -std=c99 -D_POSIX_C_SOURCE $(COPT)
+# -std=gnu99 works on gcc and clang.
+CFLAGS = -Wall -g -std=gnu99 $(COPT)
+
 PROJ = hcalc
 VERSION = 1.2u1
 MANPAGE = $(PROJ).1
@@ -71,7 +77,7 @@ version.h: VERSION
 	echo '#define VERSION "$(VERSION)"' > version.h
 
 $(PROJ): $(OBJS)
-	$(CC) -o $@ $^ $(LDFLAGS) -lXpm -lX11 $(LIBS)
+	$(CC) -o $@ $^ $(LDFLAGS) $(LIBS) -lXpm -lX11 -lm
 
 $(MANPAGE): $(PROJ).rst version.rst
 	rst2man $(PROJ).rst > $(MANPAGE)
-- 
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