maintainer-feedback requested: [Bug 234022] deskutils/kmail build failure in latest CURRENT

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked kde at FreeBSD.org for
maintainer-feedback:
Bug 234022: deskutils/kmail build failure in latest CURRENT
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234022



--- Description ---
deskutils/kmail fails to build in latest CURRENT amd64 r342058 :


FAILED:
agents/unifiedmailboxagent/CMakeFiles/akonadi_unifiedmailbox_agent.dir/unifiedm
ailboxagent.cpp.o 
/usr/bin/c++  -DKCOREADDONS_LIB -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DBUS_LIB
-DQT_DISABLE_DEPRECATED_BEFORE=0x060000 -DQT_GUI_LIB -DQT_NETWORK_LIB
-DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII
-DQT_NO_DEBUG -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT
-DQT_NO_SIGNALS_SLOTS_KEYWORDS -DQT_NO_URL_CAST_FROM_STRING
-DQT_USE_QSTRINGBUILDER -DQT_WIDGETS_LIB -DQT_XML_LIB
-DTRANSLATION_DOMAIN=\"akonadi_unifiedmailbox_agent\" -D_LARGEFILE64_SOURCE
-Iagents/unifiedmailboxagent
-I/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxag
ent
-Iagents/unifiedmailboxagent/akonadi_unifiedmailbox_agent_autogen/include
-I/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0 -I. -isystem
/usr/local/include/KF5/AkonadiAgentBase -isystem /usr/local/include -isystem
/usr/local/include/KF5 -isystem /usr/local/include/qt5 -isystem
/usr/local/include/qt5/QtDBus -isystem /usr/local/include/qt5/QtCore -isystem
/usr/local/lib/qt5/mkspecs/freebsd-clang -isystem
/usr/local/include/qt5/QtWidgets -isystem /usr/local/include/qt5/QtGui -isystem
/usr/local/include/KF5/AkonadiCore -isystem /usr/local/include/KF5/KCoreAddons
-isystem /usr/local/include/KF5/KItemModels -isystem
/usr/local/include/KF5/KConfigCore -isystem /usr/local/include/KF5/KConfigGui
-isystem /usr/local/include/qt5/QtXml -isystem
/usr/local/include/KF5/Akonadi/KMime -isystem
/usr/local/include/KF5/akonadi/kmime -isystem
/usr/local/include/KF5/AkonadiWidgets -isystem
/usr/local/include/KF5/KConfigWidgets -isystem /usr/local/include/KF5/KCodecs
-isystem /usr/local/include/KF5/KWidgetsAddons -isystem
/usr/local/include/KF5/KAuth -isystem /usr/local/include/KF5/KMime -isystem
/usr/local/include/KF5/KI18n -isystem
/usr/local/include/KF5/KIdentityManagement -isystem
/usr/local/include/KF5/KIdentityManagement/kidentitymanagement -isystem
/usr/local/include/KF5/KPIMTextEdit -isystem /usr/local/include/KF5/KIconThemes
-isystem /usr/local/include/KF5/MailCommon -isystem
/usr/local/include/KF5/mailcommon -isystem
/usr/local/include/KF5/MessageComposer -isystem
/usr/local/include/KF5/messagecomposer -isystem
/usr/local/include/KF5/MessageCore -isystem /usr/local/include/KF5/messagecore
-isystem /usr/local/include/KF5/PimCommon -isystem
/usr/local/include/KF5/pimcommon -isystem /usr/local/include/qt5/QtNetwork
-isystem /usr/local/include/KF5/KIOCore -isystem
/usr/local/include/KF5/KService -isystem /usr/local/include/qt5/QtConcurrent
-isystem /usr/local/include/KF5/Libkleo -isystem /usr/local/include/KF5/libkleo
-isystem /usr/local/include/qgpgme -isystem /usr/local/include/gpgme++ -isystem
/usr/local/include/KF5/MessageViewer -isystem
/usr/local/include/KF5/messageviewer -isystem /usr/local/include/KF5/KContacts
-isystem /usr/local/include/KF5/MimeTreeParser -isystem
/usr/local/include/KF5/mimetreeparser -isystem
/usr/local/include/KF5/PimCommonAkonadi -isystem
/usr/local/include/KF5/pimcommonakonadi -isystem /usr/local/include/KF5/KIMAP
-isystem /usr/local/include/KF5/Akonadi/Contact -isystem
/usr/local/include/KF5/akonadi/contact -isystem
/usr/local/include/KF5/KCompletion -isystem /usr/local/include/KF5/KDBusAddons
-O2 -pipe -march=nehalem -fstack-protector -fno-strict-aliasing -std=c++0x
-fno-operator-names -fno-exceptions -Wno-gnu-zero-variadic-macro-arguments
-Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security -Wno-long-long
-Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual
-Werror=return-type -Wvla -Wdate-time -fdiagnostics-color=always -pedantic
-Wzero-as-null-pointer-constant -O2 -pipe -march=nehalem -fstack-protector
-fno-strict-aliasing -fvisibility=hidden -fvisibility-inlines-hidden   -fPIC
-fexceptions -std=gnu++14 -MD -MT
agents/unifiedmailboxagent/CMakeFiles/akonadi_unifiedmailbox_agent.dir/unifiedm
ailboxagent.cpp.o
-MF
agents/unifiedmailboxagent/CMakeFiles/akonadi_unifiedmailbox_agent.dir/unifiedm
ailboxagent.cpp.o.d
-o
agents/unifiedmailboxagent/CMakeFiles/akonadi_unifiedmailbox_agent.dir/unifiedm
ailboxagent.cpp.o
-c
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxagent.cpp
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxagent.cpp:20:
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxagent.h:26:
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxmanager.h:23:
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/utils.h:27:
/usr/include/c++/v1/experimental/optional:11:2: error: "<experimental/optional>
has been removed. Use <optional> instead."
#error "<experimental/optional> has been removed. Use <optional> instead."
 ^
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxagent.cpp:20:
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxagent.h:26:
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxmanager.h:23:
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/utils.h:31:22:
error: expected namespace name
using namespace std::experimental;
		~~~~~^
In file included from
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailboxagent.cpp:21:
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailbox.h:51:11:
error: no template named 'optional' in namespace 'stdx'
    stdx::optional<qint64> collectionId() const;
    ~~~~~~^
/usr/obj/usr/ports/deskutils/kmail/work/kmail-18.12.0/agents/unifiedmailboxagen
t/unifiedmailbox.h:71:11:
error: no template named 'optional' in namespace 'stdx'
    stdx::optional<qint64> mCollectionId;
    ~~~~~~^
4 errors generated.