mastodon 270rc1 エラー

error.txt

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

current directory:
/mastodon/vendor/bundle/ruby/2.4.0/gems/nokogiri-1.10.0/ext/nokogiri
/usr/local/bin/ruby -r ./siteconf20190109-10-qh7kim.rb extconf.rb
--use-system-libraries --with-iconv-lib=/usr/local/lib
--with-iconv-include=/usr/local/include
checking if the C compiler accepts ... yes
Building nokogiri using system libraries.
Using pkg-config gem version 1.3.2
checking for libexslt... yes
checking for xmlParseDoc() in libxml/parser.h... no
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
-----
libxml2 is missing.  Please locate mkmf.log to investigate how it is failing.
-----
*** 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=/usr/local/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
	--with-pkg-config
	--without-pkg-config
	--with-override-variables
	--without-override-variables
	--with-xml2lib
	--without-xml2lib
	--with-libxml2lib
	--without-libxml2lib

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

/mastodon/vendor/bundle/ruby/2.4.0/extensions/x86_64-linux/2.4.0/nokogiri-1.10.0/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in
/mastodon/vendor/bundle/ruby/2.4.0/gems/nokogiri-1.10.0 for inspection.
Results logged to
/mastodon/vendor/bundle/ruby/2.4.0/extensions/x86_64-linux/2.4.0/nokogiri-1.10.0/gem_make.out

An error occurred while installing nokogiri (1.10.0), and Bundler cannot
continue.
Make sure that `gem install nokogiri -v '1.10.0' --source
'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  rails-settings-cached was resolved to 0.6.6, which depends on
    rails was resolved to 5.2.2, which depends on
      actioncable was resolved to 5.2.2, which depends on
        actionpack was resolved to 5.2.2, which depends on
          actionview was resolved to 5.2.2, which depends on
            rails-dom-testing was resolved to 2.0.3, which depends on
              nokogiri
ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle config build.nokogiri --use-system-libraries --with-iconv-lib=/usr/local/lib --with-iconv-include=/usr/local/include  && bundle install -j$(getconf _NPROCESSORS_ONLN) --deployment --without test development  && yarn install --pure-lockfile --ignore-engines  && yarn cache clean' returned a non-zero code: 5
mastodon@mstdn-main:~/mastodon$