Fix "work-directory references" problem another way.

archivers/ruby-libarchive/Makefile

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.7 2015/09/25 05:45:58 taca Exp $
+# $NetBSD: Makefile,v 1.8 2016/01/04 02:48:05 taca Exp $
 
 DISTNAME=	libarchive-0.1.2
 CATEGORIES=	archivers
@@ -10,9 +10,6 @@ LICENSE=	modified-bsd
 
 USE_TOOLS+=	gmake
 
-# Fix Ruby 2.2 build.
-CHECK_WRKREF_SKIP+=	lib/ruby/gems/2.2.0/doc/libarchive-0.1.2/ri/ext/*.ri
-
 .include "../../lang/ruby/gem.mk"
 .include "../../archivers/libarchive/buildlink3.mk"
 .include "../../mk/bsd.pkg.mk"

archivers/ruby-libarchive/distinfo

@@ -1,6 +1,7 @@
-$NetBSD: distinfo,v 1.3 2015/11/03 00:56:25 agc Exp $
+$NetBSD: distinfo,v 1.4 2016/01/04 02:48:05 taca Exp $
 
 SHA1 (libarchive-0.1.2.gem) = 5a7f5d5e9771f00c4ef2b030602381a29ff0eb11
 RMD160 (libarchive-0.1.2.gem) = 337296b1c31898ee7e438fd5e368fb821462c341
 SHA512 (libarchive-0.1.2.gem) = 5644e82f2a0573f084a96f11dd7a6b9b3f44e4f1190ee830d46f9ba6eeee7e498a78cee9f5af54fda5d27159f53c1c7d66bc9a9e2c8c1c18382848c0deb461ff
 Size (libarchive-0.1.2.gem) = 53760 bytes
+SHA1 (patch-ext_extconf.rb) = 82d1b14bc2c8785883c9a84d541eb18d5a080aa9

archivers/ruby-libarchive/patches/patch-ext_extconf.rb

@@ -0,0 +1,12 @@
+$NetBSD: patch-ext_extconf.rb,v 1.1 2016/01/04 02:48:05 taca Exp $
+
+* Avoid to index by rdoc.
+
+--- ext/extconf.rb.orig	2016-01-04 02:44:40.000000000 +0000
++++ ext/extconf.rb
+@@ -7,4 +7,5 @@ if system('/bin/sh configure') and have_
+   have_header('bzlib.h')
+ 
+   create_makefile('rblibarchive')
++  FileUtils.rm_f %w(config.log config.status)
+ end