configure : fails to build with MinGW under Cygwin

The below file :
qt-everywhere-opensource-src-4.8.4/mkspecs/win32-g++/qmake.conf

gives the command line for compiling with MinGW under Cygwin :
"""

1. Cross compile example for i686-w64-mingw32-g++:
2. configure xplatform win32-g++ -device-option CROSS_COMPILE=i686-w64-mingw32
   """

I used the below command line :
"""
./configure -prefix ../qt-everywhere-opensource-src-4.8.4 \
-xplatform win32-g++ \
device-option CROSS_COMPILE=i686-pc-mingw32 \
-release -opensource -confirm-license \
-static \
-largefile -no-accessibility \
-no-sql-db2 -no-sql-ibase -no-sql-mysql -no-sql-oci \
-no-sql-odbc -no-sql-psql -no-sql-sqlite -no-sql-sqlite2 \
-no-sql-sqlite_symbian -no-sql-symsql -no-sql-tds \
-no-qt3support -no-xmlpatterns -no-multimedia \
-no-audio-backend -no-phonon -no-phonon-backend \
-no-svg -no-webkit \
-no-javascript-jit -script -no-scripttools \
-declarative -no-declarative-debug \
-graphicssystem raster \
-qt-zlib \
-no-gif -no-libtiff -qt-libpng -no-libmng -no-libjpeg \
-no-openssl \
-no-nis -no-cups \
-pch \
-no-dbus \
-no-gtkstyle \
-no-nas-sound -opengl desktop -no-openvg \
-no-glib \
-nomake examples -nomake demos -nomake docs