Building on Windows with MinGW

Hi, I'm trying to build openMSX on Windows through MinGW. However, it's failing miserably right from the get-go. I installed MinGW into C:\MinGW. During installation I ticked the C++ compiler and MSYS base tools. All good. Launched a shell from C:\MinGW\msys\1.0\msys.bat and navigated to openMSX folder and entered ./configure just to be greeted with:

$ ./configure
Using Python: python3
Error determining MSYS root: b'  File "", line 1\r\n    import sys ; print sys.argv[1]\r\n                       ^\r\nSyntaxError: invalid syntax\r\n'
Exit code 1
Traceback (most recent call last):
  File "build/detectsys.py", line 5, in 
    from executils import captureStdout
  File "c:\Users\wbahnassi\Desktop\openMSX\build\executils.py", line 1, in 
    from msysutils import msysActive, msysShell
  File "c:\Users\wbahnassi\Desktop\openMSX\build\msysutils.py", line 70, in 
    msysMounts = _determineMounts()
  File "c:\Users\wbahnassi\Desktop\openMSX\build\msysutils.py", line 25, in _determineMounts
    raise OSError('Error determining MSYS root')
OSError: Error determining MSYS root
build/main.mk:126: *** No platform specified using OPENMSX_TARGET_CPU and OPENMSX_TARGET_OS and autodetection of local platform failed.  Stop.

I double-checked that my openMSX files are all ending with LF instead of CRLF (adjusted git's config to do so), and Notepad++ confirms that too, so I'm lost as to where the CRLF is creeping in from. After all, those are code-generated lines from msysutils.py:

# Figure out the root directory of MSYS.
	proc = Popen(
		[ msysShell(), '-c', '"%s" -c \'import sys ; print sys.argv[1]\' /' % sys.executable.replace('\\', '\\\\') ],
		stdin = None,
		stdout = PIPE,
		stderr = PIPE,
		)

There doesn't seem to be any new-line characters involved.. Help?

Cheers!