Gem installation issue

I am trying to use Cucumber and so Im installing some gems.Im facing problems in installing the following gems:

BigDecimal-1.1.0.gem
io-console-0.3.gem

I use Ruby1.8.7
My current Gem list

builder (3.0.0)
commonwatir (1.9.0)
cucumber (1.2.1)
diff-lcs (1.1.3)
ffi (1.1.0.rc4 x86-mingw32)
firewatir (1.9.0)
gherkin (2.11.1 ruby x86-mswin32)
hoe (3.0.6)
json (1.5.4, 1.5.0, 1.4.5 java)
minitest (2.5.1)
nokogiri (1.5.5 x86-mingw32)
rake (0.9.2.2)
rautomation (0.7.2)
rdoc (3.9.4)
rspec (2.11.0)
rspec-core (2.11.1)
rspec-expectations (2.11.1)
rspec-mocks (2.11.1)
s4t-utils (1.0.4)
user-choices (1.1.6.1)
watir (1.9.0)
win32-api (1.4.8 x86-mingw32)
win32-process (0.6.5)
windows-api (0.4.1)
windows-pr (1.2.1)
xml-simple (1.1.1)

C:\Ruby187\bin>gem install --local bigdecimal-1.1.0.gem
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing bigdecimal-1.1.0.gem:

    ERROR: Failed to build gem native extension.
    C:/Ruby187/bin/ruby.exe extconf.rb

checking for labs() in stdlib.h... yes
checking for llabs() in stdlib.h... yes
creating Makefile
make
gcc -I. -I. -IC:/Ruby187/lib/ruby/1.8/i386-mingw32 -I. -DHAVE_LABS -DHAVE_LLABS -g -O2 -DFD_SETSIZE=256 -c bigdecimal.c
In file included from bigdecimal.c:20:0:
bigdecimal.h:19:23: fatal error: ruby/ruby.h: No such file or directory
compilation terminated.
make: *** [bigdecimal.o] Error 1
Gem files will remain installed in C:/Ruby187/lib/ruby/gems/1.8/gems/bigdecimal-1.1.0 for inspection.
Results logged to C:/Ruby187/lib/ruby/gems/1.8/gems/bigdecimal-1.1.0/./gem_make.out

C:\Ruby187\bin>gem install --local io-console-0.3.gem
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing io-console-0.3.gem:

    ERROR: Failed to build gem native extension.
    C:/Ruby187/bin/ruby.exe extconf.rb

checking for rb_w32_map_errno() in ruby.h... yes
checking for sys/ioctl.h... no
checking for rb_io_get_write_io() in ruby/io.h... no
checking for dup3() in unistd.h... no
creating Makefile
make
gcc -I. -I. -IC:/Ruby187/lib/ruby/1.8/i386-mingw32 -I. -DHAVE_RB_W32_MAP_ERRNO
-g -O2 -DFD_SETSIZE=256 -c console.c console.c: In function 'console_dev':
console.c:584:6: error: 'rb_io_t' has no member named 'pathv'
make: *** [console.o] Error 1
Gem files will remain installed in C:/Ruby187/lib/ruby/gems/1.8/gems/io-console-0.3 for inspection.
Results logged to C:/Ruby187/lib/ruby/gems/1.8/gems/io-console-0.3/./gem_make.out

Please help!!!