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$ gem install wdm
Fetching wdm-0.1.1.gem
Building native extensions. This could take a while...
ERROR:  Error installing wdm:
        ERROR: Failed to build gem native extension.

    current directory: /home/user/.gem/ruby/2.6.0/gems/wdm-0.1.1/ext/wdm
/usr/bin/ruby.exe -I /usr/share/rubygems -r ./siteconf20220128-21934-1cmfehc.rb extconf.rb
checking for -lkernel32... yes
checking for windows.h... yes
checking for ruby.h... yes
checking for HAVE_RUBY_ENCODING_H... yes
checking for rb_thread_call_without_gvl()... yes
creating Makefile

current directory: /home/user/.gem/ruby/2.6.0/gems/wdm-0.1.1/ext/wdm
make "DESTDIR=" clean
rm -f
rm -f wdm_ext.so  *.o  *.bak mkmf.log .*.time

current directory: /home/user/.gem/ruby/2.6.0/gems/wdm-0.1.1/ext/wdm
make "DESTDIR="
gcc -I. -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -D_XOPEN_SOURCE -D_GNU_SOURCE    -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4    -o entry.o -c entry.c
gcc -I. -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -D_XOPEN_SOURCE -D_GNU_SOURCE    -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4    -o memory.o -c memory.c
gcc -I. -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -D_XOPEN_SOURCE -D_GNU_SOURCE    -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4    -o monitor.o -c monitor.c
gcc -I. -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -D_XOPEN_SOURCE -D_GNU_SOURCE    -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4    -o queue.o -c queue.c
queue.c: In function ‘wdm_queue_item_error_new’:
queue.c:28:14: warning: implicit declaration of function ‘_vscprintf’; did you mean ‘vsiprintf’? [-Wimplicit-function-declaration]
   28 |     length = _vscprintf(format, ap);
      |              ^~~~~~~~~~
      |              vsiprintf
gcc -I. -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -D_XOPEN_SOURCE -D_GNU_SOURCE    -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4    -o rb_change.o -c rb_change.c
rb_change.c: In function ‘extract_absolute_path_from_notification’:
rb_change.c:47:16: error: ‘_MAX_FNAME’ undeclared (first use in this function)
   47 |     WCHAR file[_MAX_FNAME], ext[_MAX_EXT], filename[WDM_MAX_FILENAME];
      |                ^~~~~~~~~~
rb_change.c:47:16: note: each undeclared identifier is reported only once for each function it appears in
rb_change.c:47:33: error: ‘_MAX_EXT’ undeclared (first use in this function); did you mean ‘EN_MAXTEXT’?
   47 |     WCHAR file[_MAX_FNAME], ext[_MAX_EXT], filename[WDM_MAX_FILENAME];
      |                                 ^~~~~~~~
      |                                 EN_MAXTEXT
rb_change.c:74:5: warning: implicit declaration of function ‘_wsplitpath’ [-Wimplicit-function-declaration]
   74 |     _wsplitpath(buffer, NULL, NULL, file, ext);
      |     ^~~~~~~~~~~
rb_change.c:47:44: warning: unused variable ‘filename’ [-Wunused-variable]
   47 |     WCHAR file[_MAX_FNAME], ext[_MAX_EXT], filename[WDM_MAX_FILENAME];
      |                                            ^~~~~~~~
rb_change.c:47:29: warning: unused variable ‘ext’ [-Wunused-variable]
   47 |     WCHAR file[_MAX_FNAME], ext[_MAX_EXT], filename[WDM_MAX_FILENAME];
      |                             ^~~
rb_change.c:47:11: warning: unused variable ‘file’ [-Wunused-variable]
   47 |     WCHAR file[_MAX_FNAME], ext[_MAX_EXT], filename[WDM_MAX_FILENAME];
      |           ^~~~
make: *** [Makefile:246: rb_change.o] Error 1

make failed, exit code 2

Gem files will remain installed in /home/user/.gem/ruby/2.6.0/gems/wdm-0.1.1 for inspection.
Results logged to /home/user/.gem/ruby/2.6.0/extensions/x86_64-cygwin/2.6.0/wdm-0.1.1/gem_make.out