[error solve] /var/lib/gems/2.5.0/gems/nokogiri-1.10



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Building native extensions. This could take a while...
ERROR:  Error installing nokogiri:
        ERROR: Failed to build gem native extension.
    current directory: /var/lib/gems/2.5.0/gems/nokogiri-1.10.1/ext/nokogiri
/usr/bin/ruby2.5 -/usr/local/lib/site_ruby/2.5.0 -r ./siteconf20190316-3942-1d1t3tz.rb extconf.rb
checking if the C compiler accepts ... yes
Building nokogiri using packaged libraries.
Using mini_portile version 2.4.0
checking for gzdopen() in -lz... no
zlib is missing; necessary for building libxml2
*** 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/bin/$(RUBY_BASE_NAME)2.5
        --help
        --clean
        --use-system-libraries
        --enable-static
        --disable-static
        --with-zlib-dir
        --without-zlib-dir
        --with-zlib-include
        --without-zlib-include=${zlib-dir}/include
        --with-zlib-lib
        --without-zlib-lib=${zlib-dir}/lib
        --enable-cross-build
        --disable-cross-build
To see why this extension failed to compile, please check the mkmf.log which can be found here:
  /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/nokogiri-1.10.1/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.5.0/gems/nokogiri-1.10.1 for inspection.
Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/nokogiri-1.10.1/gem_make.out
cs

If you see this error, you can solve problem using this command.
You have to install zlib.

sudo apt-get install zlib1g-dev