diff --git a/source-builder/config/gcc-common-1.cfg b/source-builder/config/gcc-common-1.cfg
index 35e7efa..dd0cf4c 100644
--- a/source-builder/config/gcc-common-1.cfg
+++ b/source-builder/config/gcc-common-1.cfg
@@ -190,10 +190,11 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
   %{__rmfile} $SB_BUILD_ROOT%{_mandir}/man3/*ffi*
 
   # Clean the symlinks away incase the source is a repo
-  %{__rmfile} ${source_dir_gcc}/newlib
-  %{__rmfile} ${source_dir_gcc}/mpfr
-  %{__rmfile} ${source_dir_gcc}/mpc
-  %{__rmfile} ${source_dir_gcc}/gmp
+  # Note, delete as a directory because of MSYS2 support on Windows.
+  %{__rmdir} ${source_dir_gcc}/newlib
+  %{__rmdir} ${source_dir_gcc}/mpfr
+  %{__rmdir} ${source_dir_gcc}/mpc
+  %{__rmdir} ${source_dir_gcc}/gmp
 
 %testing
   # Add testing here.
diff --git a/source-builder/sb/build.py b/source-builder/sb/build.py
index 22e0f6a..630a1a0 100644
--- a/source-builder/sb/build.py
+++ b/source-builder/sb/build.py
@@ -227,7 +227,6 @@ class build:
                         raise error.general('setup source tag not found: %d' % (source_tag))
                 else:
                     name = opt_name
-                name = self._name_(name)
             self.script.append(self.config.expand('cd %{_builddir}'))
             if not deleted_dir and  delete_before_unpack:
                 self.script.append(self.config.expand('%{__rm} -rf ' + name))
diff --git a/source-builder/sb/check.py b/source-builder/sb/check.py
index f5d38a5..d2eba4f 100644
--- a/source-builder/sb/check.py
+++ b/source-builder/sb/check.py
@@ -104,7 +104,7 @@ def path_check(opts, silent = False):
                 if not silent:
                     log.notice('error: environment PATH contains an empty path')
                 return False
-            elif p.strip() == '.' or p.strip() == '..':
+            elif not options.host_windows and (p.strip() == '.' or p.strip() == '..'):
                 if not silent:
                     log.notice('error: environment PATH invalid path: %s' % (p))
                 return False
diff --git a/source-builder/sb/download.py b/source-builder/sb/download.py
index dc1def6..9490aa0 100644
--- a/source-builder/sb/download.py
+++ b/source-builder/sb/download.py
@@ -69,7 +69,7 @@ def _hash_check(file_, absfile, macros, remove = True):
         _in = None
         try:
             hasher = hashlib.new(hash[0])
-            _in = open(absfile, 'rb')
+            _in = open(path.host(absfile), 'rb')
             hasher.update(_in.read())
         except IOError, err:
             log.notice('hash: %s: read error: %s' % (file_, str(err)))
@@ -90,7 +90,12 @@ def _hash_check(file_, absfile, macros, remove = True):
         if failed and remove:
             log.warning('removing: %s' % (file_))
             if path.exists(absfile):
-                os.remove(path.host(absfile))
+                try:
+                    os.remove(path.host(absfile))
+                except IOError, err:
+                    raise error.general('hash: %s: remove: %s' % (absfile, str(err)))
+                except:
+                    raise error.general('hash: %s: remove error' % (file_))
         if hasher is not None:
             del hasher
     else:
diff --git a/source-builder/sb/ereport.py b/source-builder/sb/ereport.py
index 897b353..88aaa16 100755
--- a/source-builder/sb/ereport.py
+++ b/source-builder/sb/ereport.py
@@ -36,7 +36,10 @@ def generate(name, opts, header = None, footer = None):
                           opts.defaults.get_value('%{_sbgit_id}'))]
     else:
         r += [' RSB: not a valid repo']
-    r += [' %s' % (' '.join(os.uname()))]
+    if os.name == 'nt':
+        r += [' Windows']
+    else:
+        r += [' %s' % (' '.join(os.uname()))]
     r += []
     r += ['Tail of the build log:']
     r += log.tail()
diff --git a/source-builder/sb/log.py b/source-builder/sb/log.py
index 8e46023..410987c 100755
--- a/source-builder/sb/log.py
+++ b/source-builder/sb/log.py
@@ -74,6 +74,7 @@ def notice(text = os.linesep, log = None):
     if not quiet and default is not None and not default.has_stdout():
         for l in text.replace(chr(13), '').splitlines():
             print l
+        sys.stdout.flush()
     _output(text, log)
 
 def trace(text = os.linesep, log = None):
diff --git a/source-builder/sb/path.py b/source-builder/sb/path.py
index 20ab73c..67aeacd 100644
--- a/source-builder/sb/path.py
+++ b/source-builder/sb/path.py
@@ -127,7 +127,14 @@ def mkdir(path):
 def removeall(path):
 
     def _onerror(function, path, excinfo):
-        print 'removeall error: (%s) %s' % (excinfo, path)
+        import stat
+        if not os.access(path, os.W_OK):
+            # Is the error an access error ?
+            os.chmod(path, stat.S_IWUSR)
+            function(path)
+        else:
+            print 'removeall error: %s' % (path)
+            raise
 
     path = host(path)
     shutil.rmtree(path, onerror = _onerror)
diff --git a/source-builder/sb/windows.py b/source-builder/sb/windows.py
index 222876d..938abfc 100644
--- a/source-builder/sb/windows.py
+++ b/source-builder/sb/windows.py
@@ -30,13 +30,18 @@ import execute
 def load():
     # Default to the native Windows Python.
     uname = 'win32'
-    system = 'mingw32'
-    if os.environ.has_key('HOSTTYPE'):
-        hosttype = os.environ['HOSTTYPE']
+    if os.environ.has_key('PROCESSOR_ARCHITECTURE'):
+        if os.environ['PROCESSOR_ARCHITECTURE'] == 'AMD64':
+            hosttype = 'x86_64'
+            machsize = '64'
+        else:
+            hosttype = 'i686'
+            machsize = '32'
     else:
-        hosttype = 'i686'
-    host_triple = hosttype + '-pc-' + system
-    build_triple = hosttype + '-pc-' + system
+        hosttype = 'x86_64'
+        machsize = '32'
+    host_triple = '%s-w%s-mingw32' % (hosttype, machsize)
+    build_triple = '%s-w%s-mingw32' % (hosttype, machsize)
 
     # See if this is actually Cygwin Python
     if os.name == 'posix':