gem install sqlite3 -- --with-sqlite3-dir=/opt/localを実行しようとしたら以下のようなエラーメッセージが。。。

Building native extensions with: '--with-sqlite3-dir=/opt/local'
This could take a while...
ERROR:  Error installing sqlite3:
	ERROR: Failed to build gem native extension.

    current directory: /home/test_user/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/sqlite3-1.3.13/ext/sqlite3
/home/test_user/.rbenv/versions/2.4.0/bin/ruby -r ./siteconf20171006-4484-7fx7vj.rb extconf.rb --with-sqlite3-dir=/opt/local
checking for sqlite3.h... no
sqlite3.h is missing. Try 'brew install sqlite3',
'yum install sqlite-devel' or 'apt-get install libsqlite3-dev'
and check your shared library search path (the
location where your sqlite3 shared library is located).
*** 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=/home/test_user/.rbenv/versions/2.4.0/bin/$(RUBY_BASE_NAME)
	--with-sqlite3-config
	--without-sqlite3-config
	--with-pkg-config
	--without-pkg-config
	--with-sqlite3-dir
	--with-sqlite3-include
	--without-sqlite3-include=${sqlite3-dir}/include
	--with-sqlite3-lib
	--without-sqlite3-lib=${sqlite3-dir}/lib

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

  /home/test_user/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-linux/2.4.0-static/sqlite3-1.3.13/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /home/test_user/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/sqlite3-1.3.13 for inspection.
Results logged to /home/test_user/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/extensions/x86_64-linux/2.4.0-static/sqlite3-1.3.13/gem_make.out

yum install sqlite-develを実行したところ

Loaded plugins: priorities, update-motd, upgrade-helper
You need to be root to perform this command.

と怒られたのでHow Can I Enable Root SSH Access in An Amazon EC2 Instance?を参考にsudo suを実行してyum install sqlite-develを実行。問題解決！