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Что и почему пошло не так и как поправить?
$ gem i rails
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
current directory: D:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/websocket-driver-0.7.1/ext/websocket-driver
D:/Ruby26-x64/bin/ruby.exe -I D:/Ruby26-x64/lib/ruby/2.6.0 -r ./siteconf20190912-8476-1pme8ot.rb extconf.rb
creating Makefile
current directory: D:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/websocket-driver-0.7.1/ext/websocket-driver
make "DESTDIR=" clean
current directory: D:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/websocket-driver-0.7.1/ext/websocket-driver
make "DESTDIR="
generating websocket_mask-x64-mingw32.def
make: *** No rule to make target '/D/Ruby26-x64/include/ruby-2.6.0/ruby.h', needed by 'websocket_mask.o'. Stop.
make failed, exit code 2
Gem files will remain installed in D:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/websocket-driver-0.7.1 for inspection.
Results logged to D:/Ruby26-x64/lib/ruby/gems/2.6.0/extensions/x64-mingw32/2.6.0/websocket-driver-0.7.1/gem_make.out
Ещё хорошо, перед тем как задавать вопрос, гуглить
