--- NetHack-NetHack-3.6.6_Released.ORIG/sys/unix/Makefile.doc	2020-03-08 12:29:31.000000000 -0500
+++ NetHack-NetHack-3.6.6_Released/sys/unix/Makefile.doc	2020-04-25 22:58:20.000000000 -0500
@@ -67,7 +67,7 @@
 
 
 GAME	= nethack
-MANDIR	= /usr/man/man6
+MANDIR	= $(DESTDIR)__PREFIX__/share/man/man6
 MANEXT	= 6
 
 # manual installation for most BSD-style systems