patch-Makefile

--- Makefile.orig	2020-09-23 11:25:51 UTC
+++ Makefile
@@ -4,21 +4,21 @@ MANTITLE=	Additional Software
 
 VERSION=	1.11
 
-PREFIX=		/usr/local/
-BINPREFIX=	${PREFIX}/bin/
-MANPREFIX=	${PREFIX}/man/man${MANSEC}/
+PREFIX?=		/usr/local/
+BINPREFIX=	${DESTDIR}${PREFIX}/bin/
+MANPREFIX=	${DESTDIR}${PREFIX}/share/man/man${MANSEC}/
 
 all:	dnstracer dnstracer.8
 
 install:
-	install dnstracer ${BINPREFIX}
+	${BSD_INSTALL_PROGRAM} dnstracer ${BINPREFIX}
 	install dnstracer.8 ${MANPREFIX}
 
 clean:
 	-rm dnstracer.o dnstracer dnstracer.8 dnstracer.core
 
 dnstracer: dnstracer.c dnstracer-missing.h
-	$(CC) -Wall -o dnstracer -DVERSION="${VERSION}" dnstracer.c
+	$(CC) $(CFLAGS) -Wall -o dnstracer -DVERSION="${VERSION}" dnstracer.c
 
 dnstracer.8: dnstracer.pod
 	pod2man --release="${MANDATE}" --date="${MANDATE}" \