BitcoinUnlimited: configure: WARNING: Could not resolve: -lqwindows; bitcoin-qt frontend will not be built

Attempted to build the bitcoin-qt wallet using an mingw environment under Windows 7.

I’ve built more current versions of most of the packages outlined in the build-windows-mingw document as you will see below. Autogen.sh works without issue, however the .configure aborts the build of bitcoin-qt per the subject line. ./configure is being invoked as:

CPPFLAGS="-I/c/deps/db-6.2.32.NC/build_unix \
-I/c/deps/openssl-1.0.2o/include \
-I/c/deps/libevent-2.0.22/include \
-I/c/deps \
-I/c/deps/protobuf-2.6.1/src \
-I/c/deps/libpng-1.6.34 \
-I/c/deps/qrencode-4.0.2" \
LDFLAGS="-L/c/deps/db-6.2.32.NC/build_unix \
-L/c/deps/openssl-1.0.2o \
-L/c/deps/libevent-2.0.22/.libs \
-L/c/deps/miniupnpc \
-L/c/deps/protobuf-2.6.1/src/.libs \
-L/c/deps/libpng-1.6.34/.libs \
-L/c/deps/qrencode-4.0.2/.libs" \
./configure \
--disable-upnp-default \
--disable-tests \
--with-qt-incdir=/c/Deps/QT/5.7.0/include \
--with-qt-libdir=/c/Deps/QT/5.7.0/lib \
--with-qt-plugindir=/c/Deps/QT/5.7.0/plugins \
--with-qt-bindir=/c/Deps/QT/5.7.0/bin \
--with-protoc-bindir=/c/deps/protobuf-2.6.1/src \
--with-incompatible-bdb

libqwindows.a is present in /c/deps/QT/5.7.0/plugins/platforms

QT was configured with:

configure.bat -release -opensource -confirm-license -static -make libs -no-sql-sqlite -no-opengl -system-zlib -qt-pcre -no-icu -no-gif -system-libpng -no-libjpeg -no-freetype -no-angle -openssl -no-dbus -no-audio-backend -no-wmf-backend -no-qml-debug -I c:\deps\libpng-1.6.34 -I c:\deps\openssl-1.0.2o\include -L c:\deps\libpng-1.6.34\.libs -L c:\deps\openssl-1.0.2o