--- PyQt5_gpl-5.9/configure.py.orig	2017-08-22 15:11:51.878439200 +0200
+++ PyQt5_gpl-5.9/configure.py	2017-08-22 15:15:44.292242200 +0200
@@ -25,6 +25,7 @@
 import shutil
 import stat
 import sys
+from sysconfig import _POSIX_BUILD
 
 
 # Initialise the constants.
@@ -414,7 +415,7 @@
         self.module_dir = sysconfig.get_python_lib(plat_specific=1)
         self.debug = hasattr(sys, 'gettotalrefcount')
 
-        if sys.platform == 'win32':
+        if sys.platform == 'win32' and not _POSIX_BUILD:
             bin_dir = sys.exec_prefix
 
             try:
@@ -443,6 +444,13 @@
             self.data_dir = sys.prefix + '/share'
             self.lib_dir = sys.prefix + '/lib'
 
+        if _POSIX_BUILD and "MSYSTEM" in os.environ:
+            self.inc_dir = os.popen(' '.join(['cygpath', '--unix', self.inc_dir])).readline().strip()
+            self.module_dir = os.popen(' '.join(['cygpath', '--unix', self.module_dir])).readline().strip()
+            self.bin_dir = os.popen(' '.join(['cygpath', '--unix', self.bin_dir])).readline().strip()
+            self.data_dir = os.popen(' '.join(['cygpath', '--unix', self.data_dir])).readline().strip()
+            self.lib_dir = os.popen(' '.join(['cygpath', '--unix', self.lib_dir])).readline().strip()
+
         # The name of the interpreter used by the pyuic5 wrapper.
         if sys.platform == 'darwin':
             # The installation of MacOS's python is a mess that changes from
@@ -638,7 +646,7 @@
         py_major = self.py_version >> 16
         py_minor = (self.py_version >> 8) & 0x0ff
 
-        if sys.platform == 'win32':
+        if sys.platform == 'win32' and not _POSIX_BUILD:
             debug_suffix = self.get_win32_debug_suffix()
 
             # See if we are using the limited API.
@@ -756,6 +764,9 @@
 
         self.designer_plugin_dir = qt_config.QT_INSTALL_PLUGINS + '/designer'
         self.qml_plugin_dir = qt_config.QT_INSTALL_PLUGINS + '/PyQt5'
+        if "MSYSTEM" in os.environ:
+            self.designer_plugin_dir = os.popen(' '.join(['cygpath', '--unix', self.designer_plugin_dir])).readline().strip()
+            self.qml_plugin_dir = os.popen(' '.join(['cygpath', '--unix', self.qml_plugin_dir])).readline().strip()
 
         if self.sysroot == '':
             self.sysroot = qt_config.QT_SYSROOT
@@ -764,6 +775,8 @@
         # in the default location.
         self.qsci_api_dir = os.path.join(qt_config.QT_INSTALL_DATA, 'qsci')
         self.qsci_api = os.path.isdir(self.qsci_api_dir)
+        if "MSYSTEM" in os.environ:
+            self.qsci_api_dir = os.popen(' '.join(['cygpath', '--unix', self.qsci_api_dir])).readline().strip()
 
         # Save the default qmake spec. and finalise the value we want to use.
         self.qmake_spec_default = qt_config.QMAKE_SPEC
@@ -771,7 +784,9 @@
         # On Windows for Qt versions prior to v5.9.0 we need to be explicit
         # about the qmake spec.
         if self.qt_version < 0x050900 and self.py_platform == 'win32':
-            if self.py_version >= 0x030500:
+            if _POSIX_BUILD:
+                self.qmake_spec = "win32-g++"
+            elif self.py_version >= 0x030500:
                 self.qmake_spec = 'win32-msvc2015'
             elif self.py_version >= 0x030300:
                 self.qmake_spec = 'win32-msvc2010'
@@ -952,6 +967,15 @@
         if opts.vendlibdir is not None:
             self.vend_lib_dir = opts.vendlibdir
 
+        if _POSIX_BUILD and "MSYSTEM" in os.environ:
+            self.pyqt_bin_dir = os.popen(' '.join(['cygpath', '--unix', self.pyqt_bin_dir])).readline().strip()
+            self.designer_plugin_dir = os.popen(' '.join(['cygpath', '--unix', self.designer_plugin_dir])).readline().strip()
+            self.pyqt_module_dir = os.popen(' '.join(['cygpath', '--unix', self.pyqt_module_dir])).readline().strip()
+            self.qsci_api_dir = os.popen(' '.join(['cygpath', '--unix', self.qsci_api_dir])).readline().strip()
+            self.pyqt_sip_dir = os.popen(' '.join(['cygpath', '--unix', self.pyqt_sip_dir])).readline().strip()
+            self.vend_inc_dir = os.popen(' '.join(['cygpath', '--unix', self.vend_inc_dir])).readline().strip()
+            self.vend_lib_dir = os.popen(' '.join(['cygpath', '--unix', self.vend_lib_dir])).readline().strip()
+
         # Handle any conflicts.
         if not self.qt_shared:
             if not self.static:
@@ -1015,7 +1015,7 @@
         # it where it is.
         if not self.static:
             pro_lines.extend(['win32 {',
-                    '    LIBS += ' + self.get_pylib_link_arguments(name=False),
+                    '    LIBS += ' + self.get_pylib_link_arguments(name=True),
                     '}'])
 
     @staticmethod
@@ -2312,7 +2336,10 @@
 
     # Create the output file, first making sure it doesn't exist.
     remove_file(out_file)
-    run_command(test + ' ' + out_file, verbose)
+    if "MSYSTEM" in os.environ:
+        run_command('sh -c "'+test + ' ' + out_file + '"', True)
+    else:
+        run_command(test + ' ' + out_file, True)
 
     if not os.access(out_file, os.F_OK):
         error("%s failed to create %s. Make sure your Qt installation is correct." % (test, out_file))