diff --git a/mkspecs/modules/qt_lib_gui_private.pri b/mkspecs/modules/qt_lib_gui_private.pri
index 5473e78..c5e7448 100644
--- a/mkspecs/modules/qt_lib_gui_private.pri
+++ b/mkspecs/modules/qt_lib_gui_private.pri
@@ -11,4 +11,9 @@ QT.gui_private.enabled_features = direct2d directwrite directwrite2 freetype gif
 QT.gui_private.disabled_features = xcb accessibility-atspi-bridge angle_d3d11_qdtd directfb egl egl_x11 eglfs eglfs_brcm eglfs_egldevice eglfs_gbm eglfs_mali eglfs_viv eglfs_viv_wl evdev fontconfig integrityfb integrityhid kms libinput libinput-axis-api linuxfb mirclient mtdev system-freetype system-xcb tslib vnc xkbcommon-evdev xlib
 QMAKE_LIBS_HARFBUZZ = -lharfbuzz
 QMAKE_LIBS_LIBJPEG = -ljpeg
-QMAKE_LIBS_LIBPNG = -llibpng16
+CONFIG(release, debug|release) {
+  QMAKE_LIBS_LIBPNG = -llibpng16
+}
+CONFIG(debug, debug|release) {
+  QMAKE_LIBS_LIBPNG = -llibpng16d
+}
diff --git a/mkspecs/qconfig.pri b/mkspecs/qconfig.pri
index 2af37df..646b8e5 100644
--- a/mkspecs/qconfig.pri
+++ b/mkspecs/qconfig.pri
@@ -2,8 +2,14 @@ QT_ARCH = x86_64
 QT_BUILDABI = x86_64-little_endian-lp64
 QT.global.enabled_features = shared c++11 concurrent
 QT.global.disabled_features = cross_compile framework rpath appstore-compliant debug_and_release simulator_and_device build_all c++14 c++1z pkg-config force_asserts separate_debug_info static
-QT_CONFIG += shared release c++11 concurrent dbus no-pkg-config stl
-CONFIG += shared release no_plugin_manifest
+CONFIG(release, debug|release) {
+  QT_CONFIG += shared release c++11 concurrent dbus no-pkg-config stl
+  CONFIG += shared release no_plugin_manifest
+}
+CONFIG(debug, debug|release) {
+  QT_CONFIG += shared debug c++11 concurrent dbus no-pkg-config release_tools stl
+  CONFIG += shared debug no_plugin_manifest
+}
 QT_VERSION = 5.9.2
 QT_MAJOR_VERSION = 5
 QT_MINOR_VERSION = 9
diff --git a/mkspecs/qmodule.pri b/mkspecs/qmodule.pri
index 3e213d4..00a37ca 100644
--- a/mkspecs/qmodule.pri
+++ b/mkspecs/qmodule.pri
@@ -1,10 +1,17 @@
 EXTRA_INCLUDEPATH += C:/vcpkg/installed/x64-windows/include
-EXTRA_LIBDIR += C:/vcpkg/installed/x64-windows/lib
+CONFIG(release, debug|release) {
+  EXTRA_LIBDIR += C:/vcpkg/installed/x64-windows/lib
+  QT.global_private.enabled_features = alloca_malloc_h alloca sse2 dbus gui network qml-debug sql system-zlib testlib widgets xml
+  QT.global_private.disabled_features = alloca_h android-style-assets private_tests dbus-linked libudev posix_fallocate reduce_exports reduce_relocations release_tools stack-protector-strong
+  QMAKE_LIBS_ZLIB = -lzlib
+}
+CONFIG(debug, debug|release) {
+  QT.global_private.enabled_features = alloca_malloc_h alloca sse2 dbus gui network qml-debug release_tools sql system-zlib testlib widgets xml
+  QT.global_private.disabled_features = alloca_h android-style-assets private_tests dbus-linked libudev posix_fallocate reduce_exports reduce_relocations stack-protector-strong
+  QMAKE_LIBS_ZLIB = -lzlibd
+}
 QT_CPU_FEATURES.x86_64 = sse sse2
-QT.global_private.enabled_features = alloca_malloc_h alloca sse2 dbus gui network qml-debug sql system-zlib testlib widgets xml
-QT.global_private.disabled_features = alloca_h android-style-assets private_tests dbus-linked libudev posix_fallocate reduce_exports reduce_relocations release_tools stack-protector-strong
 QT_COORD_TYPE = double
-QMAKE_LIBS_ZLIB = -lzlib
 CONFIG += sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2 compile_examples f16c largefile msvc_mp precompile_header
 QT_BUILD_PARTS += libs tools
 QT_HOST_CFLAGS_DBUS +=