--- Makefile.orig	2018-10-06 02:29:08 UTC
+++ Makefile
@@ -3,7 +3,7 @@ BINPREFIX ?= "$(PREFIX)/bin"
 
 OS = $(shell uname)
 ifeq ($(OS), FreeBSD)
-	MANPREFIX ?= "$(PREFIX)/man/man1"
+	MANPREFIX = "$(PREFIX)/man/man1"
 else
 	MANPREFIX ?= "$(PREFIX)/share/man/man1"
 endif