Issue installing Watir (and other Gems) on Windows

Hi, completely new to Ruby, which I'm using to try out Watir. I seem to
be having issues installing Watir (and other Gems in general). Got as
far as figuring out where the mkmf.log file is located, and it contains

package configuration for libffi is not found
"x86_64-w64-mingw32-gcc -o conftest.exe
-IC:/Ruby/include/ruby-2.0.0/ruby/backward -IC:/Ruby/include/ruby-2.0.0
-fno-omit-frame-pointer -fno-fast-math -g -Wall -Wextra
-Wno-unused-parameter -Wno-parentheses -Wno-long-long
-Wno-missing-field-initializers -Wunused-variable -Wpointer-arith
-Wwrite-strings -Wdeclaration-after-statement
-Wimplicit-function-declaration conftest.c -L. -LC:/Ruby/lib -L.
-lx64-msvcrt-ruby200 -lshell32 -lws2_32 -limagehlp -lshlwapi "
checked program was:
/* begin */
1: #include "ruby.h"
3: #include <winsock2.h>
4: #include <windows.h>
5: int main(int argc, char **argv)
6: {
7: return 0;
8: }
/* end */

Can anyone assist me with fixing this, what to check, etc?

Ruby is installed at C:\Ruby, and the development kit is installed at



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