```ruby
# -*- encoding: utf-8 -*-
Gem::Specification.new do |s|
  s.name = 'postgresql_connector'
  s.summary = 'PostgreSQL Connector for Sequel'
  s.version = '0.0.0'
  s.authors = ['']
  s.require_paths = ['lib']
  s.files = Dir.glob('{lib}/**/*')
  s.platform = Gem::Platform::RUBY
  s.required_ruby_version = '>= 1.9.2'

  s.add_runtime_dependency 'sequel', '4.14.0'
end
```

Add jdbc postgres runtime dependency to gemspec.
user
```ruby
# -*- encoding: utf-8 -*-
Gem::Specification.new do |s|
  s.name = 'postgresql_connector'
  s.summary = 'PostgreSQL Connector for Sequel'
  s.version = '0.0.0'
  s.authors = ['']
  s.require_paths = ['lib']
  s.files = Dir.glob('{lib}/**/*')
  s.platform = Gem::Platform::RUBY
  s.required_ruby_version = '>= 1.9.2'

  s.add_runtime_dependency 'sequel', '4.14.0'
  s.add_runtime_dependency 'jdbc-postgres', '9.3.1102'
end
```
assistant