C:\Users\jay95>gem install dryrun
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions. This could take a while...
ERROR: Error installing dryrun:
ERROR: Failed to build gem native extension.

current directory: C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/rjb-1.6.4/ext

C:/Ruby27-x64/bin/ruby.exe -I C:/Ruby27-x64/lib/ruby/2.7.0 -r ./siteconf20211021-19364-1j9vjd4.rb extconf.rb
*** 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=C:/Ruby27-x64/bin/$(RUBY_BASE_NAME)
extconf.rb:46:in open': No such file or directory @ dir_initialize - C:\\Program Files\\Java\\jdk-14.0.1\\bin\\include (Errno::ENOENT) from extconf.rb:46:in

extconf failed, exit code 1

Gem files will remain installed in C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/rjb-1.6.4 for inspection.
Results logged to C:/Ruby27-x64/lib/ruby/gems/2.7.0/extensions/x64-mingw32/2.7.0/rjb-1.6.4/gem_make.out