Building native extensions. This could take a while...
ERROR:  Error installing sqlite3-ruby:
        ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.5.0/gems/sqlite3-1.4.2/ext/sqlite3
/usr/bin/ruby2.5 -r ./siteconf20200525-12863-yyba0l.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.5.0/gems/sqlite3-1.4.2 for inspection.
Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/sqlite3-1.4.2/gem_make.out