Windows.h errors when including QtGui but not QtCore

patrickkidd · 10 Dec 2020, 00:57

I am getting the following error when including QtGui. Including QtCore works just fine:

Microsoft (R) Program Maintenance Utility Version 14.27.29112.0
Copyright (C) Microsoft Corporation.  All rights reserved.

        cl -c -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zc:__cplusplus -O2 -MD -W0 -EHsc -D_UNICODE -DWIN32 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -DWIN64 -DPYQTDEPLOY_OPTIMIZED -DPK_DEBUG_BUILD=0 -DXML_STATIC -DMS_WINDOWS -D_WIN32_WINNT=Py_WINVER -DNTDDI_VERSION=Py_NTDDI -DWINVER=Py_WINVER -DNDEBUG -DQT_NO_DEBUG -DQT_QUICKWIDGETS_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -I..\..\vendor\sysroot-win-64\include -I..\..\vendor\sysroot-win-64\include\python3.7 -I..\..\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_blake2 -I..\..\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes -I..\..\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes\libffi_msvc -I..\..\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_sha3 -I..\..\vendor\sysroot-win-64\src\Python-3.7.8\Modules\expat -I..\..\pkdiagram\vedana\build -I..\..\..\Qt\5.15.1\msvc2019_64\include -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtQuickWidgets -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtQuick -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtPrintSupport -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtWidgets -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtGui -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtANGLE -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtQmlModels -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtQml -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtNetwork -I..\..\..\Qt\5.15.1\msvc2019_64\include\QtCore -Irelease -I/include -I..\..\..\Qt\5.15.1\msvc2019_64\mkspecs\win32-msvc  -Forelease\ @C:\Users\patrick\AppData\Local\Temp\nm83FA.tmp
_pkdiagram.cpp
C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um\winuser.h(4383): error C2061: syntax error: identifier 'LPWNDCLASSEXA'
C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um\winuser.h(4391): error C2061: syntax error: identifier 'LPWNDCLASSEXW'
C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um\prsht.h(609): error C3646: 'hdr': unknown override specifier
C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um\prsht.h(609): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

Here is the qmake file that produced the error:

# Generated for win-64 and Python v3.7.8.

TEMPLATE = app

QT += quickwidgets printsupport gui network qml widgets quick
CONFIG += warn_off

RESOURCES = \
    resources/pyqtdeploy.qrc

DEFINES += PYQTDEPLOY_OPTIMIZED
DEFINES += PK_DEBUG_BUILD=0
DEFINES += XML_STATIC

INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\include
INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\include\python3.7
INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_blake2
INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes
INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/libffi_msvc
INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_sha3
INCLUDEPATH += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\expat

SOURCES = pyqtdeploy_main.cpp pyqtdeploy_start.cpp pdytools_module.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/_pkdiagram.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/_pkdiagram_win32.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/release/moc__pkdiagram.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/release/moc_unsafearea.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramAppFilter.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramCUtil.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramFDDocument.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramPathItemBase.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramPathItemDelegate.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramPersonDelegate.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramQMap0100QString0100QString.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/build/_pkdiagram/sip_pkdiagramcmodule.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/_pkdiagram/unsafearea.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/vedana/_vedana.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/vedana/build/_vedana/release/moc_qaesencryption.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/vedana/build/_vedana/sip_vedanacmodule.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/vedana/encryption.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\../../../pkdiagram/vedana/qaesencryption.cpp
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_abc.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_bisectmodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_blake2/blake2b_impl.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_blake2/blake2module.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_blake2/blake2s_impl.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_contextvarsmodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/_ctypes.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/callbacks.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/callproc.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/cfield.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/libffi_msvc/ffi.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/libffi_msvc/prep_cif.c
MASMSOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/libffi_msvc/win64.asm
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/malloc_closure.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ctypes/stgdict.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_datetimemodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_hashopenssl.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_heapqmodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_json.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_lsprof.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_math.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_opcode.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_pickle.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_queuemodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_randommodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_sha3/sha3module.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_ssl.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_struct.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\_winapi.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\binascii.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\expat/xmlparse.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\expat/xmlrole.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\expat/xmltok.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\mathmodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\pyexpat.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\rotatingtree.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\selectmodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\socketmodule.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\unicodedata.c
SOURCES += C:\familydiagram\vendor\sysroot-win-64\src\Python-3.7.8\Modules\zlibmodule.c

HEADERS = pyqtdeploy_version.h frozen_bootstrap.h frozen_bootstrap_external.h

LIBS += -LC:\familydiagram\vendor\sysroot-win-64\lib
LIBS += -LC:\familydiagram\vendor\sysroot-win-64\lib\python3.7\site-packages\PyQt5
LIBS += -lQtCore
LIBS += -lQtGui
LIBS += -lQtNetwork
LIBS += -lQtPrintSupport
LIBS += -lQtQml
LIBS += -lQtQuick
LIBS += -lQtQuickWidgets
LIBS += -lQtWidgets
LIBS += -llibcrypto
LIBS += -llibssl
LIBS += -lpython37
LIBS += -lsip
LIBS += -lzlib

cython.name = Cython compiler
cython.input = CYTHONSOURCES
cython.output = ${QMAKE_FILE_BASE}.c
cython.variable_out = GENERATED_SOURCES
cython.commands = cython ${QMAKE_FILE_IN} -o ${QMAKE_FILE_OUT}

QMAKE_EXTRA_COMPILERS += cython

linux-* {
    LIBS += -lutil -ldl
}

win32 {
    masm.input = MASMSOURCES
    masm.output = ${QMAKE_FILE_BASE}.obj

    contains(QMAKE_TARGET.arch, x86_64) {
        masm.name = MASM64 compiler
        masm.commands = ml64 /Fo ${QMAKE_FILE_OUT} /c ${QMAKE_FILE_IN}
    } else {
        masm.name = MASM compiler
        masm.commands = ml /Fo ${QMAKE_FILE_OUT} /c ${QMAKE_FILE_IN}
    }

    QMAKE_EXTRA_COMPILERS += masm

    LIBS += -lshlwapi -ladvapi32 -lshell32 -luser32 -lws2_32 -lole32 -loleaut32 -lversion
    DEFINES += MS_WINDOWS _WIN32_WINNT=Py_WINVER NTDDI_VERSION=Py_NTDDI WINVER=Py_WINVER

    # This is added from the qmake spec files but clashes with _pickle.c.
    DEFINES -= UNICODE
}

macx {
    LIBS += -framework SystemConfiguration -framework CoreFoundation
}

_PKDIAGRAM = $$PWD/../../pkdiagram/_pkdiagram
VEDANA = $$PWD/../../pkdiagram/vedana

# HEADERS += $$_PKDIAGRAM/_pkdiagram.h

INCLUDEPATH += $$VEDANA/build

PK_ENTITLEMENTS.name = CODE_SIGN_ENTITLEMENTS
PK_ENTITLEMENTS.value = Family Diagram.entitlements
QMAKE_MAC_XCODE_SETTINGS += PK_ENTITLEMENTS

QMAKE_INFO_PLIST = Info.plist
ICON = PKDiagram-Filled.icns

!win32 {
    debug {
        QMAKE_CFLAGS += -DPK_DEBUG_BUILD=1
        QMAKE_CXXFLAGS += -DPK_DEBUG_BUILD=1
    }
    release {
        # QMAKE_CFLAGS += -DPK_DEBUG_BUILD=0
        # QMAKE_CXXFLAGS += -DPK_DEBUG_BUILD=0
    }
}

beta {
	QMAKE_CFLAGS += -DPK_BETA_BUILD=1
	QMAKE_CXXFLAGS += -DPK_BETA_BUILD=1
}

alpha {
	QMAKE_CFLAGS += -DPK_ALPHA_BUILD=1
	QMAKE_CXXFLAGS += -DPK_ALPHA_BUILD=1
}

mac {
	RESOURCES += ../../resources/pkdiagram.qrc ../../resources/qml/qml.qrc
}

macx {

	alpha|beta|release {
		# Sparkle
		sparkle.files = Vendor/Sparkle.framework
		sparkle.path = Contents/Frameworks
		QMAKE_BUNDLE_DATA += sparkle
		QMAKE_CXXFLAGS += -F$$PWD -DPK_USE_SPARKLE=1
		QMAKE_LFLAGS += -rpath @executable_path/../Frameworks -F$$PWD
		LIBS += -L$$PWD -framework Sparkle

		# AppCenter
		LIBS += -FVendor -framework AppCenter -framework AppCenterAnalytics -framework AppCenterCrashes
		QMAKE_CFLAGS += -fmodules -fcxx-modules -DPK_USE_APPCENTER=1
		QMAKE_CXXFLAGS += -Werror -fmodules -fcxx-modules -DPK_USE_APPCENTER=1
	}

	## Bundle Resources
	QMAKE_INFO_PLIST = Info.plist
	ICON = PKDiagram-Filled.icns
	app_icon.files = PKDiagram-Filled.icns
	app_icon.path = Contents/Resources
	QMAKE_BUNDLE_DATA += app_icon
	doc_icon.files = PKDiagram-Document.icns
	doc_icon.path = Contents/Resources
	QMAKE_BUNDLE_DATA += doc_icon

	# User Manual
	usermanual.files = ../../doc/User-Manual
	usermanual.path = Contents/Resources
	QMAKE_BUNDLE_DATA += usermanual

	# openssl
	INCLUDEPATH += /usr/local/Cellar/openssl@1.1/1.1.1g/include
	LIBS += -L/usr/local/Cellar/openssl@1.1/1.1.1g/lib

	LIBS += -framework AppKit
	# QMAKE_MAC_SDK = macosx10.12
	# QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.12
	# QMAKE_DEVELOPMENT_TEAM = 8KJB799CU7
	QMAKE_TARGET_BUNDLE_PREFIX = com.vedanamedia
	QMAKE_BUNDLE = familydiagrammac

}

ios {

	bundle_id.name = PRODUCT_BUNDLE_IDENTIFIER
	bundle_id.value = com.vedanamedia.familydiagram
	QMAKE_MAC_XCODE_SETTINGS += bundle_id

#	PK_CODE_SIGN_IDENTITY.name = CODE_SIGN_IDENTITY
##	PK_CODE_SIGN_IDENTITY.value = iPhone Developer: Patrick Stinson (J5VYQMUDH6)
#	PK_CODE_SIGN_IDENTITY.value = iOS Distribution
#	QMAKE_MAC_XCODE_SETTINGS += PK_CODE_SIGN_IDENTITY

#	PK_PROVISIONING_PROFILE_DEBUG.name = PROVISIONING_PROFILE_Debug
#	PK_PROVISIONING_PROFILE_DEBUG.value = 15d4b3c7-6194-4a14-baa5-f38743326429
#	QMAKE_MAC_XCODE_SETTINGS += PK_PROVISIONING_PROFILE_DEBUG

#	PK_PROVISIONING_PROFILE_SPECIFIER_DEBUG.name = PROVISIONING_PROFILE_SPECIFIER_Debug
#	PK_PROVISIONING_PROFILE_SPECIFIER_DEBUG.value = Family Diagram Development
#	QMAKE_MAC_XCODE_SETTINGS += PK_PROVISIONING_PROFILE_SPECIFIER_DEBUG

	PK_PROVISIONING_PROFILE_RELEASE.name = PROVISIONING_PROFILE_Release
	PK_PROVISIONING_PROFILE_RELEASE.value = 
	QMAKE_MAC_XCODE_SETTINGS += PK_PROVISIONING_PROFILE_DEBUG

	PK_PROVISIONING_PROFILE_SPECIFIER_RELEASE.name = PROVISIONING_PROFILE_SPECIFIER_Release
	PK_PROVISIONING_PROFILE_SPECIFIER_RELEASE.value = 
	QMAKE_MAC_XCODE_SETTINGS += PK_PROVISIONING_PROFILE_SPECIFIER_RELEASE

	SETTINGS_BUNDLE_DATA.files = PKDiagram.png $$files($$PWD/Settings.bundle)
	SETTINGS_BUNDLE_DATA.path = $$DESTDIR_TARGET
	QMAKE_BUNDLE_DATA += SETTINGS_BUNDLE_DATA

}


win32 {
	# fatal error C1189: #error:  The C++ Standard Library forbids macroizing keywords. Enable warning C4005 to find the forbidden macro.
	# DEFINES += _XKEYCHECK_H

	# CONFIG += precompiled_header
	# PRECOMPILED_HEADER = ..\win32-config\pch.h
	# PRECOMPILED_SOURCE = ..\win32-config\pch.cpp
	# HEADERS += ..\win32-config\pch.h
}

Any idea how to fix this compile error?

Seems like this sort of thing usually as to do with platform-oriented defines or config settings. But it's been a long time since I've done serious windows build system work.

Thanks!

jsulm · 12 Oct 2020, 04:27

@patrickkidd What exact compiler and Qt versions do you use?

patrickkidd · 12 Oct 2020, 04:30

@jsulm Visual Studio 2019 (v142), qt-5.15.1 installed from qt.io installer, Windows 10 Pro with all latest updates.

jsulm · 12 Oct 2020, 04:31

@patrickkidd Can you reproduce this issue with a minimal application including QtGui module?
Your qmake file looks quite complex, could be that something there is causing the issue.

patrickkidd · J jsulm 12 Oct 2020, 04:30

@jsulm said in Windows.h errors when including QtGui but not QtCore:

@patrickkidd Can you reproduce this issue with a minimal application including QtGui module?
Your qmake file looks quite complex, could be that something there is causing the issue.

The age-old question. I suppose I was hoping for it to be well-known enough to have a simple answer. I'll see what I can do with a simple example.

KH-219Design · 13 Oct 2020, 06:48

@patrickkidd said in Windows.h errors when including QtGui but not QtCore:

prsht.h(609): error C3646: 'hdr': unknown override specifier

Please take everything I say here with a grain of salt, and fact-check me aggressively, because I am definitely more of a Linux developer than Microsoft Windows.

However, I think this might be more of an issue of "general usage of Win32 in C++" than anything particular to Qt. Which in today's case (your case, @patrickkidd ) is likely to be good news, because the universe of people who know about this error is bigger than the universe of just Qt users.

To my surprise, the EXACT error (with line numbers and all!) has many hits on a web search: "prsht.h(609): error C3646: hdr: unknown override specifier"

Maybe these help?

https://stackoverflow.com/questions/51901643/c-compilation-error-in-standard-windows-sdk-files

http://python.6.x6.nabble.com/Expat-bug-in-pyqtdeploy-metadata-python-metadata-py-td5242933.html

https://social.msdn.microsoft.com/Forums/vstudio/en-US/160fb20e-c2b5-463a-a126-95989dc32b35/compilation-error-from-unknown-inclusion-in-vc-2015?forum=vcgeneral

(they all suggest either adding particular #include lines, or moving certain #include lines higher up in your files. this is a "game" i remember not-so-fondly from my Win32 days)

patrickkidd · wrote on 13 Oct 2020, 06:48

@KH-219Design Yeah, I've dealt with this problem and its derivatives plenty of times over the years. As indicated in the posts you link, it usually has something to do with getting the order of windows.h and other headers (QtGui in this case) right. Less likely a stray macro. Though no luck in this case yet.

patrickkidd · 14 Oct 2020, 07:37

I was able to solve this for this project by including Python.h before QtGui. Including windows.h should have fixed it, but it doesn't. Oh well.

KroMignon · 14 Oct 2020, 15:31

@patrickkidd I often got suck kind of problems with Windows and Qt. The solution I found is to use #include "qt_windows.h" instead of #include "windows.h"

hope this helps

patrickkidd · wrote on 14 Oct 2020, 15:31

@KroMignon said in Windows.h errors when including QtGui but not QtCore:

@patrickkidd I often got suck kind of problems with Windows and Qt. The solution I found is to use #include "qt_windows.h" instead of #include "windows.h"

hope this helps

Interesting. I was not aware of this header. But it also didn't solve it for me. Including Python.h did. No idea how that is so.