Compiling Mesa3D windows 64bit

I am new to opengl and mesa3D library I have some problem in compiling mesa3d library on windows 8.1 64 bit machine..

I tried to follow this post Building Mesa for windows 7. Mesa 9.1 but I didn't succeed when I try to build the library with scons by this command

scons platform=windows toolchain=mingw machine=x86_64 mesagdi libgl-gdi

I get the following error

Checking for X11 (x11 xext xdamage xfixes)... no
Checking for XCB (x11-xcb xcb-glx >= 1.8.1)... no
Checking for XF86VIDMODE (xxf86vm)... no
Checking for DRM (libdrm >= 2.4.24)... no
Checking for DRM_INTEL (libdrm_intel >= 2.4.30)... no
Checking for XORG (xorg-server >= 1.6.0)... no
Checking for KMS (libkms >= 2.4.24)... no
Checking for UDEV (libudev > 150)... no
fatal: Not a git repository (or any of the parent directories): .git
WindowsError: [Error 3] The system cannot find the path specified:
  File "C:\Users\Admin\Downloads\Compressed\Mesa\SConstruct", line 151:
    duplicate = 0 # http://ift.tt/1DqJ7iF
  File "C:\Python27\scons-2.3.4\SCons\Script\SConscript.py", line 614:
    return method(*args, **kw)
  File "C:\Python27\scons-2.3.4\SCons\Script\SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "C:\Python27\scons-2.3.4\SCons\Script\SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "C:\Users\Admin\Downloads\Compressed\Mesa\src\SConscript", line 27:
    SConscript('mesa/SConscript')
  File "C:\Python27\scons-2.3.4\SCons\Script\SConscript.py", line 614:
    return method(*args, **kw)
  File "C:\Python27\scons-2.3.4\SCons\Script\SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "C:\Python27\scons-2.3.4\SCons\Script\SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "C:\Users\Admin\Downloads\Compressed\Mesa\src\mesa\SConscript", line 453:
    write_git_sha1_h_file("main/git_sha1.h")
  File "C:\Users\Admin\Downloads\Compressed\Mesa\src\mesa\SConscript", line 448:
    os.rename(tempfile, filename)

Even though there is a SConstruct file in the given path