gem fetch and unpack

Luis@KEORE (D:\Users\Luis\projects\oss\rubyforge)
$ gem fetch character-encodings
Downloaded character-encodings-0.4.1

Luis@KEORE (D:\Users\Luis\projects\oss\rubyforge)
$ gem unpack character-encodings-0.4.1.gem
Unpacked gem: 'D:/Users/Luis/projects/oss/rubyforge/character-encodings-0.4.1'

rake extensions

Luis@KEORE (D:\Users\Luis\projects\oss\rubyforge\character-encodings-0.4.1)
$ rake extensions
(in D:/Users/Luis/projects/oss/rubyforge/character-encodings-0.4.1)
D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-131/bin/ruby extconf.rb
checking for ‘-std=c99’ option to compiler... yes
checking for ‘-finline-functions’ option to compiler... yes
checking for ‘-Wall’ option to compiler... yes
checking for ‘-Wextra’ option to compiler... yes
checking for ‘-Wwrite-strings’ option to compiler... yes
checking for ‘-Waggregate-return’ option to compiler... yes
checking for ‘-Wmissing-prototypes’ option to compiler... yes
checking for ‘-Wmissing-declarations’ option to compiler... yes
checking for ‘-Wnested-externs’ option to compiler... yes
checking for ‘-Wundef’ option to compiler... yes
checking for ‘-Wpointer-arith’ option to compiler... yes
checking for ‘-Wcast-align’ option to compiler... yes
checking for ‘-Werror’ option to compiler... yes
checking for ‘-Winline’ option to compiler... yes
checking for assert.h... yes
checking for limits.h... yes
checking for locale.h... yes
checking for stdbool.h... yes
checking for stddef.h... yes
checking for stdint.h... yes
checking for stdio.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for sys/types.h... yes
checking for wchar.h... yes
creating Makefile
make -C ext/encoding/character/utf-8
make.exe": Entering directory `/d/Users/Luis/projects/oss/rubyforge/character-encodings-0.4.1/ext/encoding/character/utf-8'
gcc -I. -ID:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-131/lib/ruby/1.8/i386-mingw32 -ID:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-131/lib/ruby/1.8/i386-mingw32 -I. -DHAVE_ASSERT_H -DHAVE_LIMITS_H -DHAVE_LOCALE_H -DHAVE_STDBOOL_H -DHAVE_STDDEF_H -DHAVE_STDINT_H -DHAVE_STDIO_H -DHAVE_STDLIB_H -DHAVE_STRING_H -DHAVE_SYS_TYPES_H -DHAVE_WCHAR_H  -g -O2  -std=c99 -finline-functions -Wall -Wextra -Wwrite-strings -Waggregate-return -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Wundef -Wpointer-arith -Wcast-align -Werror -Winline  -c break.c
gcc -I. -ID:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-131/lib/ruby/1.8/i386-mingw32 -ID:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-131/lib/ruby/1.8/i386-mingw32 -I. -DHAVE_ASSERT_H -DHAVE_LIMITS_H -DHAVE_LOCALE_H -DHAVE_STDBOOL_H -DHAVE_STDDEF_H -DHAVE_STDINT_H -DHAVE_STDIO_H -DHAVE_STDLIB_H -DHAVE_STRING_H -DHAVE_SYS_TYPES_H -DHAVE_WCHAR_H  -g -O2  -std=c99 -finline-functions -Wall -Wextra -Wwrite-strings -Waggregate-return -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Wundef -Wpointer-arith -Wcast-align -Werror -Winline  -c decompose.c
decompose.c: In function `_utf_normalize_wc':
decompose.c:410: warning: visibility attribute not supported in this configuration; ignored
make.exe": *** [decompose.o] Error 1
make.exe": Leaving directory `/d/Users/Luis/projects/oss/rubyforge/character-encodings-0.4.1/ext/encoding/character/utf-8'
rake aborted!
Command failed with status (2): [make -C ext/encoding/character/utf-8...]
D:/Users/Luis/projects/oss/rubyforge/character-encodings-0.4.1/rakefile:71
(See full trace by running task with --trace)