TestFailed! nmake /f win32\Makefile.msc Failed running

[kematy]

I wonder know what is wrong?

Ruby Packer (rubyc) v2.7.1.dev

• entrance: E:/ruby-packer/test/qinHw.rb
• options: {:output=>"E:/ruby-packer/test/a.exe", :tmpdir=>"C:/Users/DELL/AppData/Local/Temp/rubyc", :openssl_dir=>"/usr/local/etc/openssl/"}

-> rm -rf C:/Users/DELL/AppData/Local/Temp/rubyc
-> rm -rf C:/Users/DELL/AppData/Local/Temp/rubyc/build_pass2
-> mkdir -p C:/Users/DELL/AppData/Local/Temp/rubyc
-> mkdir -p C:/Users/DELL/AppData/Local/Temp/rubyc/build_pass1
-> mkdir -p C:/Users/DELL/AppData/Local/Temp/rubyc/build_pass2
-> mkdir -p C:/Users/DELL/AppData/Local/Temp/rubyc/rubyc_work_dir_dummy
-> cp -r "/enclose_io_memfs/local/ruby" "C:/Users/DELL/AppData/Local/Temp/rubyc/ruby-2.7.1.dev"
/enclose_io_memfs/local/lib/compiler/utils.rb:93: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/enclose_io_memfs/lib/ruby/2.7.0/fileutils.rb:463: warning: The called method `cp_r' is defined here
-> cd C:/Users/DELL/AppData/Local/Temp/rubyc/ruby-2.7.1.dev
-> cd E:/ruby-packer/test
-> cp -r "/enclose_io_memfs/local/vendor/zlib" "C:/Users/DELL/AppData/Local/Temp/rubyc/zlib"
=> Stuffing zlib...
=> Saving output to C:/Users/DELL/AppData/Local/Temp/rubyc/stuff_zlib.log
-> cd C:/Users/DELL/AppData/Local/Temp/rubyc/zlib
-> CI=true ENCLOSE_IO_USE_ORIGINAL_RUBY=true MAKE=nmake CL=/MP nmake /f win32\Makefile.msc
Failed running [{"CI"=>"true", "ENCLOSE_IO_USE_ORIGINAL_RUBY"=>"true", "MAKE"=>"nmake", "CL"=>"/MP"}, "nmake /f win32\Makefile.msc"]

[kematy]

"Open Visual Studio's "x64 Native Tools Command Prompt" and execute rubyc --help therein."
I just use cmd to execute rubyc. too many gems takes too many time!