Visual C++ 2008 was used to compile oyagame.dll.
Select Release mode and "Multi-threaded (/MT)" for RuntimeLibrary setting.
A folder named "include" must be created and contain SDL.h etc.

The dll files other than oyagame.dll were obtained from www.libsdl.org and
cotained in this distribution due to the LGPL lisence.
To obtain the source files for there dlls, please go to www.libsdl.org or
ask it in sfcmini.sourceforge.jp.