--- ./Makefile.orig	2014-02-18 11:25:22.776279198 +0100
+++ ./Makefile	2014-02-18 11:25:42.052279336 +0100
@@ -12,8 +12,8 @@
 
 install: pty
 	gzip pty.1
-	${INSTALL_MAN} pty.1.gz ${PREFIX}/man/man1/
-	${INSTALL_PROGRAM} pty ${PREFIX}/bin
+	${BSD_INSTALL_MAN} pty.1.gz ${DESTDIR}${MANPREFIX}/man/man1/
+	${BSD_INSTALL_PROGRAM} pty ${DESTDIR}${PREFIX}/bin
 
 deinstall:
 	rm -r ${PREFIX}/bin/pty