Enviroment: Windows 10, CygWin, Ruby 2.2.5p319, Gem 2.6.6

gem install wdm

consu_000@SocialSLA ~
$ gem install wdm
Building native extensions.  This could take a while...
ERROR:  Error installing wdm:
        ERROR: Failed to build gem native extension.

    current directory: /cygdrive/c/Users/consu_000/.gem/ruby/gems/wdm-0.1.1/ext/wdm
/usr/bin/ruby.exe -r ./siteconf20160812-12032-1pdjkhp.rb extconf.rb
checking for main() in -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

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /home/consu_000/.gem/ruby/extensions/x86_64-cygwin/wdm-0.1.1/mkmf.log

current directory: /cygdrive/c/Users/consu_000/.gem/ruby/gems/wdm-0.1.1/ext/wdm
make "DESTDIR=" clean
rm -f
rm -f wdm_ext.so  *.o  *.bak mkmf.log .*.time

current directory: /cygdrive/c/Users/consu_000/.gem/ruby/gems/wdm-0.1.1/ext/wdm
make "DESTDIR="
gcc -I. -I/usr/include/ruby-2.2.0 -I/usr/include/ruby-2.2.0/ruby/backward -I/usr/include/ruby-2.2.0 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL     -ggdb -O2 -pipe -Wimplicit-function-declaration    -o entry.o -c entry.c
gcc -I. -I/usr/include/ruby-2.2.0 -I/usr/include/ruby-2.2.0/ruby/backward -I/usr/include/ruby-2.2.0 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL     -ggdb -O2 -pipe -Wimplicit-function-declaration    -o memory.o -c memory.c
gcc -I. -I/usr/include/ruby-2.2.0 -I/usr/include/ruby-2.2.0/ruby/backward -I/usr/include/ruby-2.2.0 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL     -ggdb -O2 -pipe -Wimplicit-function-declaration    -o monitor.o -c monitor.c
gcc -I. -I/usr/include/ruby-2.2.0 -I/usr/include/ruby-2.2.0/ruby/backward -I/usr/include/ruby-2.2.0 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL     -ggdb -O2 -pipe -Wimplicit-function-declaration    -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’ [-Wimplicit-function-declaration]
     length = _vscprintf(format, ap);
              ^
gcc -I. -I/usr/include/ruby-2.2.0 -I/usr/include/ruby-2.2.0/ruby/backward -I/usr/include/ruby-2.2.0 -I. -DHAVE_WINDOWS_H -DHAVE_RUBY_H -DHAVE_CONST_HAVE_RUBY_ENCODING_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL     -ggdb -O2 -pipe -Wimplicit-function-declaration    -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)
     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)
     WCHAR file[_MAX_FNAME], ext[_MAX_EXT], filename[WDM_MAX_FILENAME];
                                 ^
rb_change.c:74:5: warning: implicit declaration of function ‘_wsplitpath’ [-Wimplicit-function-declaration]
     _wsplitpath(buffer, NULL, NULL, file, ext);
     ^
make: *** [Makefile:239: rb_change.o] Error 1

make failed, exit code 2

Gem files will remain installed in /home/consu_000/.gem/ruby/gems/wdm-0.1.1 for inspection.
Results logged to /home/consu_000/.gem/ruby/extensions/x86_64-cygwin/wdm-0.1.1/gem_make.out

consu_000@SocialSLA ~

did you find a solution?