diff --git a/5.15.1/qtbase/mkspecs/common/msvc-desktop.conf b/5.15.1/qtbase/mkspecs/common/msvc-desktop.conf
new file mode 100644
index 0000000..8350a66
--- /dev/null
+++ b/5.15.1/qtbase/mkspecs/common/msvc-desktop.conf
@@ -0,0 +1,120 @@
+#
+# This file is used as a basis for the following compilers:
+#
+# - Microsoft C/C++ Optimizing Compiler (all desktop versions)
+# - Intel C++ Compiler on Windows
+# - Clang-cl
+#
+# Baseline:
+#
+# - Visual Studio 2005 (8.0), VC++ 14.0
+#
+# Version-specific settings go in msvc-version.conf (loaded by default_pre)
+#
+
+MAKEFILE_GENERATOR      = MSVC.NET
+QMAKE_PLATFORM          = win32
+QMAKE_COMPILER          = msvc
+CONFIG                 += flat debug_and_release debug_and_release_target precompile_header autogen_precompile_source embed_manifest_dll embed_manifest_exe
+# MSVC 2017 15.8+ fixed std::aligned_storage but compilation fails without
+# _ENABLE_EXTENDED_ALIGNED_STORAGE flag since the fix breaks binary compatibility.
+DEFINES                += UNICODE _UNICODE WIN32 _ENABLE_EXTENDED_ALIGNED_STORAGE
+DEFINES_RELEASE        += NDEBUG
+QMAKE_COMPILER_DEFINES += _WIN32
+contains(QMAKE_TARGET.arch, x86_64) {
+    DEFINES += WIN64
+    QMAKE_COMPILER_DEFINES += _WIN64
+}
+
+QMAKE_CFLAGS_OPTIMIZE_DEBUG = -Od
+QMAKE_CFLAGS_OPTIMIZE      = -O2
+QMAKE_CFLAGS_OPTIMIZE_SIZE = -O1
+
+QMAKE_CC                = cl
+QMAKE_LEX               = flex
+QMAKE_LEXFLAGS          =
+QMAKE_YACC              = bison -y
+QMAKE_YACCFLAGS         = -d
+QMAKE_CFLAGS            = -nologo -Zc:wchar_t
+QMAKE_CFLAGS_WARN_ON    = -W3
+QMAKE_CFLAGS_WARN_OFF   = -W0
+QMAKE_CFLAGS_RELEASE    = $$QMAKE_CFLAGS_OPTIMIZE -MD -Zi
+QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -Zi -MD
+QMAKE_CFLAGS_DEBUG      = -Zi -MDd
+QMAKE_CFLAGS_YACC       =
+QMAKE_CFLAGS_LTCG       = -GL
+
+contains(QMAKE_TARGET.arch, x86_64) {
+    # SSE2 is mandatory on 64-bit mode, so skip the option. It triggers:
+    # cl : Command line warning D9002 : ignoring unknown option '-arch:SSE2'
+    QMAKE_CFLAGS_SSE2   =
+} else {
+    QMAKE_CFLAGS_SSE2   = -arch:SSE2
+}
+QMAKE_CFLAGS_SSE3       = $$QMAKE_CFLAGS_SSE2
+QMAKE_CFLAGS_SSSE3      = $$QMAKE_CFLAGS_SSE2
+QMAKE_CFLAGS_SSE4_1     = $$QMAKE_CFLAGS_SSE2
+QMAKE_CFLAGS_SSE4_2     = $$QMAKE_CFLAGS_SSE2
+QMAKE_CFLAGS_AESNI      = $$QMAKE_CFLAGS_SSE2
+QMAKE_CFLAGS_SHANI      = $$QMAKE_CFLAGS_SSE2
+
+QMAKE_CXX               = $$QMAKE_CC
+QMAKE_CXXFLAGS          = $$QMAKE_CFLAGS
+QMAKE_CXXFLAGS_WARN_ON  = $$QMAKE_CFLAGS_WARN_ON -w34100 -w34189 -w44996
+QMAKE_CXXFLAGS_WARN_OFF = $$QMAKE_CFLAGS_WARN_OFF
+QMAKE_CXXFLAGS_RELEASE  = $$QMAKE_CFLAGS_RELEASE
+QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO
+QMAKE_CXXFLAGS_DEBUG    = $$QMAKE_CFLAGS_DEBUG
+QMAKE_CXXFLAGS_YACC     = $$QMAKE_CFLAGS_YACC
+QMAKE_CXXFLAGS_LTCG     = $$QMAKE_CFLAGS_LTCG
+QMAKE_CXXFLAGS_STL_ON   = -EHsc
+QMAKE_CXXFLAGS_STL_OFF  =
+QMAKE_CXXFLAGS_RTTI_ON  = -GR
+QMAKE_CXXFLAGS_RTTI_OFF =
+QMAKE_CXXFLAGS_EXCEPTIONS_ON = -EHsc
+QMAKE_CXXFLAGS_EXCEPTIONS_OFF =
+
+QMAKE_INCDIR            =
+
+QMAKE_RUN_CC            = $(CC) -c $(CFLAGS) $(INCPATH) -Fo$obj $src
+QMAKE_RUN_CC_IMP        = $(CC) -c $(CFLAGS) $(INCPATH) -Fo$@ $<
+QMAKE_RUN_CC_IMP_BATCH  = $(CC) -c $(CFLAGS) $(INCPATH) -Fo$@ @<<
+QMAKE_RUN_CXX           = $(CXX) -c $(CXXFLAGS) $(INCPATH) -Fo$obj $src
+QMAKE_RUN_CXX_IMP       = $(CXX) -c $(CXXFLAGS) $(INCPATH) -Fo$@ $<
+QMAKE_RUN_CXX_IMP_BATCH = $(CXX) -c $(CXXFLAGS) $(INCPATH) -Fo$@ @<<
+
+QMAKE_LINK              = link
+QMAKE_LFLAGS            = /NOLOGO /DYNAMICBASE /NXCOMPAT
+QMAKE_LFLAGS_RELEASE    = /OPT:REF /INCREMENTAL:NO
+QMAKE_LFLAGS_RELEASE_WITH_DEBUGINFO = /DEBUG /OPT:REF /INCREMENTAL:NO
+QMAKE_LFLAGS_DEBUG      = /DEBUG
+QMAKE_LFLAGS_CONSOLE    = /SUBSYSTEM:CONSOLE
+QMAKE_LFLAGS_WINDOWS    = /SUBSYSTEM:WINDOWS
+QMAKE_LFLAGS_EXE        = \"/MANIFESTDEPENDENCY:type=\'win32\' name=\'Microsoft.Windows.Common-Controls\' version=\'6.0.0.0\' publicKeyToken=\'6595b64144ccf1df\' language=\'*\' processorArchitecture=\'*\'\"
+QMAKE_LFLAGS_DLL        = /DLL
+QMAKE_LFLAGS_LTCG       = /LTCG
+QMAKE_PREFIX_SHLIB      =
+QMAKE_EXTENSION_SHLIB   = dll
+QMAKE_PREFIX_STATICLIB  =
+QMAKE_EXTENSION_STATICLIB = lib
+
+QMAKE_LIBS              =
+QMAKE_LIBS_GUI          = gdi32.lib comdlg32.lib oleaut32.lib imm32.lib winmm.lib ws2_32.lib ole32.lib uuid.lib user32.lib advapi32.lib
+QMAKE_LIBS_NETWORK      = ws2_32.lib user32.lib gdi32.lib
+QMAKE_LIBS_OPENGL       = glu32.lib opengl32.lib gdi32.lib user32.lib
+QMAKE_LIBS_OPENGL_ES2   = gdi32.lib user32.lib
+QMAKE_LIBS_OPENGL_ES2_DEBUG = gdi32.lib user32.lib
+QMAKE_LIBS_COMPAT       = advapi32.lib shell32.lib comdlg32.lib user32.lib gdi32.lib ws2_32.lib
+QMAKE_LIBS_QT_ENTRY     = -lqtmain
+
+QMAKE_IDL               = midl
+QMAKE_LIB               = lib /NOLOGO
+QMAKE_RC                = rc /NOLOGO
+
+VCPROJ_EXTENSION        = .vcproj
+VCSOLUTION_EXTENSION    = .sln
+VCPROJ_KEYWORD          = Qt4VSv1.0
+
+include(angle.conf)
+include(windows-desktop.conf)
+include(windows-vulkan.conf)