I have downloaded and installed mingw-w64 (64bit/gcc 4.9.1) tool chains.
The problem is that ‘No Disk In Drive D:’ dialog is appear when I execute gcc.exe.
It is caused by hard coded reference ‘D:/msys64’.
I made tiny patch program to resolve this issue.
It will change the path string ‘D:/msys’ to ‘C:/msys’.