$NetBSD$

--- doc/Makefile.am.orig	2004-07-21 15:45:26.000000000 +0000
+++ doc/Makefile.am	2010-02-27 03:15:00.000000000 +0000
@@ -44,5 +44,5 @@
 #---------------------------------------------------------------
 
-docdir = $(prefix)/doc
+docdir = $(pkgdatadir)
 doc_DATA = \
 	user-guide.pdf 
@@ -77,9 +77,9 @@
 install-data-local:
 	for f in $(doc_DATA); do \
-	  $(mkinstalldirs) $(docdir); \
-	  $(INSTALL_DATA) $$f $(docdir)/$$f; \
+	  $(mkinstalldirs) $(DESTDIR)$(docdir); \
+	  $(INSTALL_DATA) $$f $(DESTDIR)$(docdir)/$$f; \
 	  d=`basename $$f .pdf`; \
-	  $(mkinstalldirs) $(docdir)/$$d; \
-	  $(INSTALL_DATA) $$d/* $(docdir)/$$d; \
+	  $(mkinstalldirs) $(DESTDIR)$(docdir)/$$d; \
+	  $(INSTALL_DATA) $$d/* $(DESTDIR)$(docdir)/$$d; \
 	done
 
