output

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

    current directory: /usr/local/bundle/gems/openssl-2.1.2/ext/openssl
/usr/local/bin/ruby -I /usr/local/lib/ruby/site_ruby/2.4.0 -r ./siteconf20190328-8-1cl37f1.rb extconf.rb
checking for t_open() in -lnsl... no
checking for socket() in -lsocket... no
checking for openssl/ssl.h... 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/local/bin/$(RUBY_BASE_NAME)
	--with-openssl-dir
	--without-openssl-dir
	--with-openssl-include
	--without-openssl-include=${openssl-dir}/include
	--with-openssl-lib
	--without-openssl-lib=${openssl-dir}/lib
	--with-kerberos-dir
	--without-kerberos-dir
	--with-kerberos-include
	--without-kerberos-include=${kerberos-dir}/include
	--with-kerberos-lib
	--without-kerberos-lib=${kerberos-dir}/lib
	--with-debug
	--without-debug
	--enable-debug
	--disable-debug
	--with-nsllib
	--without-nsllib
	--with-socketlib
	--without-socketlib
	--with-openssl-config
	--without-openssl-config
	--with-pkg-config
	--without-pkg-config
extconf.rb:97:in `<main>': OpenSSL library could not be found. You might want to use --with-openssl-dir=<dir> option to specify the prefix where OpenSSL is installed. (RuntimeError)

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

  /usr/local/bundle/extensions/x86_64-linux/2.4.0/openssl-2.1.2/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/bundle/gems/openssl-2.1.2 for inspection.
Results logged to /usr/local/bundle/extensions/x86_64-linux/2.4.0/openssl-2.1.2/gem_make.out

An error occurred while installing openssl (2.1.2), and Bundler cannot continue.
Make sure that `gem install openssl -v '2.1.2' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  openssl