OSX への nokogiri 1.6.8.rc3 の install でハマって解決したメモ

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最初

普通に bundle install したら、以下のエラーでこけた。

libxml2-2.9.3 の compile に失敗してる。変数 LZMA_OK が無いとかいうエラー。。。

http://louistiao.me/posts/installing-lxml-on-mac-osx-1011-inside-a-virtualenv-with-pip/ では、(pip だから文脈は違うけど)OSX では libxml2-2.9.3 じゃない version を使えって書いてる。

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory: /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.rc3/ext/nokogiri
/Users/[user]/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20160304-52550-ujlj25.rb extconf.rb
Using pkg-config version 1.1.7
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using packaged libraries.
Using mini_portile version 2.1.0
checking for iconv.h... yes
checking for gzdopen() in -lz... yes
checking for iconv... yes
************************************************************************
IMPORTANT NOTICE:

Building Nokogiri with a packaged version of libxml2-2.9.3.

Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:

gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]

If you are using Bundler, tell it to use the option:

bundle config build.nokogiri --use-system-libraries
bundle install

Note, however, that nokogiri is not fully compatible with arbitrary
versions of libxml2 provided by OS/package vendors.
************************************************************************
Extracting libxml2-2.9.3.tar.gz into tmp/x86_64-apple-darwin15.3.0/ports/libxml2/2.9.3... OK
Running 'configure' for libxml2 2.9.3... OK
Running 'compile' for libxml2 2.9.3... ERROR, review '/Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.rc3/ext/nokogiri/tmp/x86_64-apple-darwin15.3.0/ports/libxml2/2.9.3/compile.log' to see what happened. Last lines are:
========================================================================
unsigned short* in = (unsigned short*) inb;
^~~~~~~~~~~~~~~~~~~~~
encoding.c:815:27: warning: cast from 'unsigned char *' to 'unsigned short *' increases required alignment from 1 to 2 [-Wcast-align]
unsigned short* out = (unsigned short*) outb;
^~~~~~~~~~~~~~~~~~~~~~
4 warnings generated.
CC error.lo
CC parserInternals.lo
CC parser.lo
CC tree.lo
CC hash.lo
CC list.lo
CC xmlIO.lo
xmlIO.c:1450:52: error: use of undeclared identifier 'LZMA_OK'
ret = (__libxml2_xzclose((xzFile) context) == LZMA_OK ) ? 0 : -1;
^
1 error generated.
make[2]: *** [xmlIO.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
========================================================================
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/[user]/.rbenv/versions/2.3.0/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
/Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:366:in `block in execute': Failed to complete compile task (RuntimeError)
from /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:337:in `chdir'

from /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:337:in `execute'
from /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:111:in `compile'

from /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/mini_portile2-2.1.0/lib/mini_portile2/mini_portile.rb:150:in `cook'
from extconf.rb:328:in `block (2 levels) in process_recipe'

from extconf.rb:221:in `block in chdir_for_build'
from extconf.rb:220:in `chdir'

from extconf.rb:220:in `chdir_for_build'
from extconf.rb:327:in `block in process_recipe'

from extconf.rb:226:in `tap'
from extconf.rb:226:in `process_recipe'

from extconf.rb:507:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/nokogiri-1.6.8.rc3/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.rc3 for inspection.
Results logged to /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/nokogiri-1.6.8.rc3/gem_make.out


system の libxml2 を使って解決

nokogiri に利用する libxml2 の指定を任せると 2.9.3 を compile しようとしてコケちゃうみたいなので、homebrew で pkg-config を入れてその中の libxmll2 を利用する事にした。ちなみに実際に利用したのは libxml2-2.9.1

上記で出たエラーメッセージに従って、bundle install 時に system の libxml2 を使うという設定をする

bundle config build.nokogiri --use-system-libraries

設定値は、 ~/.bundle/config から確認出来る。


~/.bundle/config

---

BUNDLE_GEM__COC: 'false'
BUNDLE_GEM__MIT: 'true'
BUNDLE_GEM__TEST: 'false'
BUNDLE_BUILD__NOKOGIRI: "--use-system-libraries"

この状態で再び bundle install。またエラーが出る。

Installing nokogiri 1.6.8.rc3 with native extensions

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory: /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.rc3/ext/nokogiri
/Users/[user]/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20160304-57103-8nd8hm.rb extconf.rb --use-system-libraries
Using pkg-config version 1.1.7
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using system libraries.
ERROR: cannot discover where libxml2 is located on your system. please make sure `pkg-config` is installed.
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/[user]/.rbenv/versions/2.3.0/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-libxml-2.0-config
--without-libxml-2.0-config
--with-pkg-config
--without-pkg-config
--with-xslt-dir
--without-xslt-dir
--with-xslt-include
--without-xslt-include=${xslt-dir}/include
--with-xslt-lib
--without-xslt-lib=${xslt-dir}/lib
--with-libxslt-config
--without-libxslt-config
--with-exslt-dir
--without-exslt-dir
--with-exslt-include
--without-exslt-include=${exslt-dir}/include
--with-exslt-lib
--without-exslt-lib=${exslt-dir}/lib
--with-libexslt-config
--without-libexslt-config

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/nokogiri-1.6.8.rc3/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/nokogiri-1.6.8.rc3 for inspection.
Results logged to /Users/[user]/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-15/2.3.0-static/nokogiri-1.6.8.rc3/gem_make.out

以下の様なエラーメッセージが出てて、どうもリンカが libxml2 を見つけられてないっぽい。

ERROR: cannot discover where libxml2 is located on your system. please make sure `pkg-config` is installed.

brew link --force libxml2 で解決した。

$ brew link --force libxml2

Linking /usr/local/Cellar/libxml2/2.9.1... 16 symlinks created

$ ls -la /usr/local/lib/libxml2.*

lrwxr-xr-x 1 [user] admin 43 3 4 10:57 /usr/local/lib/libxml2.2.dylib -> ../Cellar/libxml2/2.9.1/lib/libxml2.2.dylib
lrwxr-xr-x 1 [user] admin 37 3 4 10:57 /usr/local/lib/libxml2.a -> ../Cellar/libxml2/2.9.1/lib/libxml2.a
lrwxr-xr-x 1 [user] admin 41 3 4 10:57 /usr/local/lib/libxml2.dylib -> ../Cellar/libxml2/2.9.1/lib/libxml2.dylib