$NetBSD: patch-Makefile.in,v 1.1 2022/10/03 13:47:20 nros Exp $

* don't generate and install docs, if doxygen is not
  found it just installs a README mentioning the html
  docs.

--- Makefile.in.orig	2022-10-03 11:57:46.096267685 +0000
+++ Makefile.in
@@ -338,7 +338,7 @@ tmp = @tmp@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-SUBDIRS = src doc
+SUBDIRS = src
 dist_noinst_DATA = INSTALL README THANKS AUTHORS COPYING COPYING.LESSER
 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-recursive