output.txt

 gem install racc
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions. This could take a while...
ERROR:  Error installing racc:
        ERROR: Failed to build gem native extension.

    current directory: C:/tools/ruby30/lib/ruby/gems/3.0.0/gems/racc-1.5.2/ext/racc/cparse
C:/tools/ruby30/bin/ruby.exe -I C:/tools/ruby30/lib/ruby/3.0.0 -r ./siteconf20210320-1704-7y7twe.rb extconf.rb
checking for rb_ary_subseq()... yes
creating Makefile

current directory: C:/tools/ruby30/lib/ruby/gems/3.0.0/gems/racc-1.5.2/ext/racc/cparse
make "DESTDIR=" clean

current directory: C:/tools/ruby30/lib/ruby/gems/3.0.0/gems/racc-1.5.2/ext/racc/cparse
make "DESTDIR="
generating cparse-x64-mingw32.def
make: *** No rule to make target '/C/tools/ruby30/include/ruby-3.0.0/ruby.h', needed by 'cparse.o'.  Stop.

make failed, exit code 2

Gem files will remain installed in C:/tools/ruby30/lib/ruby/gems/3.0.0/gems/racc-1.5.2 for inspection.

Results logged to C:/tools/ruby30/lib/ruby/gems/3.0.0/extensions/x64-mingw32/3.0.0/racc-1.5.2/gem_make.out