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Does the compiler also report the other declaration of int8_t?
You can send the full compiler output to windiana@users.sf.net.
Try "make 2>&1 > compile_output.txt" to write the output to file.

The most probably cause is the declaration of int8_t in cppconn/config.h. However, the modified cppconn/config.h.cm generates the following condition there:
#if defined(_WIN32) && !defined(__MINGW32__)

Typically using mingw gcc defines __MINGW32__ and thus the duplicate declaration of int8_t should be avoided. You can check the compiler defines by calling gcc with an arbitrary C++ file and "-dM -E":
gcc -dM -E cppconn/config.h | grep MINGW