Building native extensions. This could take a while...
ERROR:  Error installing do_mysql:
    ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.5.0/gems/do_mysql-0.10.17/ext/do_mysql
/usr/bin/ruby2.5 -r ./siteconf20181228-4132-w825mn.rb extconf.rb
checking for mysql_query() in -lmysqlclient... no
*** 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/$(RUBY_BASE_NAME)2.5
    --with-mysql-config
    --without-mysql-config
    --with-mysql-dir
    --without-mysql-dir
    --with-mysql-include
    --without-mysql-include=${mysql-dir}/include
    --with-mysql-lib
    --without-mysql-lib=${mysql-dir}/lib
    --with-mysqlclientlib
    --without-mysqlclientlib

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/do_mysql-0.10.17/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.5.0/gems/do_mysql-0.10.17 for inspection.
Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/do_mysql-0.10.17/gem_make.out

Я понятия не имею, почему, но предполагаю, что ошибка может быть из пути или каталога или, возможно, библиотек.

У кого-нибудь есть идеи, что не так?

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