$NetBSD$

--- Makefile.orig	2011-04-04 22:07:17.000000000 +0000
+++ Makefile
@@ -15,7 +15,7 @@ VERSION		 = 1.11.1
 VDATE		 = 04 April 2011
 CFLAGS		+= -g -DHAVE_CONFIG_H -DVERSION="\"$(VERSION)\""
 CFLAGS     	+= -W -Wall -Wstrict-prototypes -Wno-unused-parameter -Wwrite-strings
-PREFIX		 = /usr/local
+PREFIX		?= /usr/local
 BINDIR		 = $(PREFIX)/bin
 INCLUDEDIR	 = $(PREFIX)/include/mandoc
 LIBDIR		 = $(PREFIX)/lib/mandoc
@@ -290,6 +290,7 @@ clean:
 install: all
 	mkdir -p $(DESTDIR)$(BINDIR)
 	mkdir -p $(DESTDIR)$(EXAMPLEDIR)
+	mkdir -p $(DESTDIR)$(LIBDIR)
 	mkdir -p $(DESTDIR)$(MANDIR)/man1
 	mkdir -p $(DESTDIR)$(MANDIR)/man3
 	mkdir -p $(DESTDIR)$(MANDIR)/man7