'pre-condition 'config.unix && libs.zlib' failed' error for builds on Windows

configure -v -opensource -confirm-license -release -shared -platform win32-g++ -c++std c++14 -zlib -opengl dynamic

<snip>

Checking for zlib...
Trying source 0 (type inline) of library zlib ...
  => source failed condition 'config.msvc'.
Trying source 1 (type inline) of library zlib ...
+ cd /d c:\libQT-5.10-dev\build\config.tests\zlib && c:\libQT-5.10-dev\build\qtbase\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" "LIBS += -lz" C:/libQT-5.10-dev/build/config.tests/zlib
+ cd /d c:\libQT-5.10-dev\build\config.tests\zlib && set MAKEFLAGS=& mingw32-make
> g++ -c -fno-keep-inline-dllexport -O2 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -I. -Ic:\libQT-5.10-dev\build\qtbase\mkspecs\win32-g++  -o main.o main.cpp
> g++ -Wl,-s -Wl,-subsystem,console -mthreads -o zlib.exe main.o  -lz
 => source accepted.
test config.qtbase.libraries.zlib succeeded

<snip>

test config.qtwebengine.tests.bison succeeded
Checking for embedded...
test config.qtwebengine.tests.embedded FAILED
Checking for flex...
Found flex from path: C:/libQT-5.10-dev/build/gnuwin32/bin/flex.exe
test config.qtwebengine.tests.flex succeeded
Checking for gperf...
Found gperf from path: C:/libQT-5.10-dev/build/gnuwin32/bin/gperf.exe
test config.qtwebengine.tests.gperf succeeded
Checking for python2...
'python2.exe' not found in PATH. Checking for 'python.exe'.
test config.qtwebengine.tests.python2 gave result C:/ProgramData/Python64/python.exe
Checking for d-bus...
Trying source 0 (type pkgConfig) of library dbus ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.dbus FAILED
Checking for fontconfig...
Trying source 0 (type pkgConfig) of library fontconfig ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.fontconfig FAILED
Checking for libdrm...
Trying source 0 (type pkgConfig) of library libdrm ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.libdrm FAILED
Checking for system ninja...
Building own ninja
test config.qtwebengine.tests.ninja FAILED
Checking for xcomposite...
Trying source 0 (type pkgConfig) of library xcomposite ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.xcomposite FAILED
Checking for xcursor...
Trying source 0 (type pkgConfig) of library xcursor ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.xcursor FAILED
Checking for xi...
Trying source 0 (type pkgConfig) of library xi ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.xi FAILED
Checking for xrandr...
Trying source 0 (type pkgConfig) of library xrandr ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.xrandr FAILED
Checking for xtst...
Trying source 0 (type pkgConfig) of library xtst ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.xtst FAILED
Checking for harfbuzz >= 1.4.2...
Trying source 0 (type pkgConfig) of library harfbuzz ...
pkg-config use disabled globally.
  => source produced no result.
test config.qtwebengine.libraries.harfbuzz FAILED
Checking for winversion...
+ cd /d c:\libQT-5.10-dev\build\config.tests\winversion && c:\libQT-5.10-dev\build\qtbase\bin\qmake.exe "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" C:/libQT-5.10-dev/build/qtwebengine/config.tests/winversion
+ cd /d c:\libQT-5.10-dev\build\config.tests\winversion && set MAKEFLAGS=& mingw32-make
> g++ -c -fno-keep-inline-dllexport -O2 -w -fexceptions -mthreads -DUNICODE -D_UNICODE -Ic:\libQT-5.10-dev\build\qtwebengine\config.tests\winversion -I. -Ic:\libQT-5.10-dev\build\qtbase\mkspecs\win32-g++  -o winversion.o c:\libQT-5.10-dev\build\qtwebengine\config.tests\winversion\winversion.cpp
> c:\libQT-5.10-dev\build\qtwebengine\config.tests\winversion\winversion.cpp:30:2: error: #error VS 2015 Update 3 with Cumulative Servicing Release or higher is required
>  #error VS 2015 Update 3 with Cumulative Servicing Release or higher is required
>   ^~~~~
> mingw32-make: *** [Makefile:163: winversion.o] Error 1
test config.qtwebengine.tests.winversion FAILED
Done running configuration tests.

Configure summary:

Build type: win32-g++ (x86_64, CPU features: cx16 mmx sse sse2 sse3)
Configuration: sse2 aesni sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples f16c largefile precompile_header rdrnd shani shared release c++11 c++14 concurrent dbus no-pkg-config stl
Build options:

<snip>

Support enabled for:
  Using system zlib ...................... yes

<snip>

Qt WebEngine:
  Embedded build ......................... no
  Pepper Plugins ......................... yes
  Printing and PDF ....................... yes
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. yes
  Use System Ninja ....................... no
  Geolocation ............................ yes

Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.

ERROR: Feature 'system-zlib' was enabled, but the pre-condition 'config.unix && libs.zlib' failed.