Ok, so I figured out that the Makefile generated by win32/configure.bat 
contains some definitions, which can be changed. More specifically, the 
RT define can be changed as follows:

RT = msvcrt

to get msvcrt-ruby200.dll instead of msvcr100-ruby200.dll.

But my question is that by default, why does it generate the file name 
beginning with msvcr100... while the RubyInstaller contains the file 
msvcr-ruby200.dll?

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