ruby-debug on 1.9.3 (Windows)

Couldn't get the gems installed yet:

>gem install ruby-debug-base19 --version=0.11.26 -- --configure-options --with-ruby-include="C:\PROGRA~2\Ruby\1.9.3-p0\include\ruby-1.9.1\ruby-1.9.3-p0"
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-debug-base19:
        ERROR: Failed to build gem native extension.

        C:/PROGRA~2/Ruby/1.9.3-p0/bin/ruby.exe extconf.rb --configure-options --with-ruby-include=C:\PROGRA~2\Ruby\1.9.3-p0\include\ruby-1.9.1\ruby-1.9.3-p0
checking for rb_method_entry_t.called_id in method.h... yes
checking for vm_core.h... yes
checking for iseq.h... yes
checking for insns.inc... yes
checking for insns_info.inc... yes
checking for eval_intern.h... yes
checking for struct iseq_line_info_entry in vm_core.h,iseq.h... no
checking for struct iseq_insn_info_entry in vm_core.h,iseq.h... yes
checking for if rb_iseq_compile_with_option was added an argument filepath... yes
creating Makefile

make
generating ruby_debug-i386-mingw32.def
compiling breakpoint.c
breakpoint.c:3:21: fatal error: vm_core.h: No such file or directory
compilation terminated.
make: *** [breakpoint.o] Error 1


Gem files will remain installed in C:/PROGRA~2/Ruby/1.9.3-p0/lib/ruby/gems/1.9.1/gems/ruby-debug-base19-0.11.26 for inspection.
Results logged to C:/PROGRA~2/Ruby/1.9.3-p0/lib/ruby/gems/1.9.1/gems/ruby-debug-base19-0.11.26/ext/ruby_debug/gem_make.out

Luis Lavena lent me a hand on this, but that couldn't solve the problem.

Update: Moving your Ruby installation to a path without spaces fixes the problem. I thought PROGRA~2 could work just find. Thanks Luis once again.