kdelibs4 @4.14.3 port 2.6.2 fail to build

[AlainT]

12682 :info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/build/solid/solid && /usr/bin/clang++  -DKDE4_CMAKE_TOPLEVEL_DIR_LENGTH=139 -DKDE_DEPRECATED_WARNINGS -DQT_NO_C      AST_TO_ASCII -DQT_NO_STL -DQT_USE_FAST_CONCATENATION -DQT_USE_FAST_OPERATOR_PLUS -D_REENTRANT -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/build/solid/solid -I/opt/local      /var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3/solid/solid -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_      ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/build -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.      macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3/interfaces -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3/solid -I/op      t/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/build/solid -I/opt/local/libexec/qt4/include/QtCrypto -I/opt/local/libexec/qt4/include -I/opt/local/libexec/qt4/include/QtCore -I      /opt/local/libexec/qt4/include/QtDBus  -pipe -Os -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -fno-common -DNDEBUG -DQT_NO_DEBUG -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -mmacosx-version-min=      10.15   -D__APPLE_KDE__  -o CMakeFiles/solid_static.dir/ifaces/block.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3/solid/solid/ifaces/block.cpp
12683 :info:build In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3/kdoctools/meinproc_simple.cpp:4:
12684 :info:build In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_kde_kdelibs4/kdelibs4/work/kdelibs-4.14.3/kdoctools/xslt.h:4:
12685 :info:build In file included from /opt/local/include/libxml2/libxml/parser.h:810:
12686 :info:build In file included from /opt/local/include/libxml2/libxml/encoding.h:31:
12687 :info:build In file included from /opt/local/include/unicode/ucnv.h:53:
12688 :info:build In file included from /opt/local/include/libxml2/unicode/uenum.h:23:
12689 :info:build /opt/local/include/libxml2/unicode/localpointer.h:71:51: warning: deleted function definitions are a C++11 extension [-Wc++11-extensions]
12690 :info:build     static void* U_EXPORT2 operator new(size_t) = delete;
12691 :info:build                                                   ^
12692 :info:build /opt/local/include/libxml2/unicode/localpointer.h:72:53: warning: deleted function definitions are a C++11 extension [-Wc++11-extensions]
12693 :info:build     static void* U_EXPORT2 operator new[](size_t) = delete;
12694 :info:build                                                     ^
12695 :info:build /opt/local/include/libxml2/unicode/localpointer.h:74:58: warning: deleted function definitions are a C++11 extension [-Wc++11-extensions]
12696 :info:build     static void* U_EXPORT2 operator new(size_t, void*) = delete;
12697 :info:build                                                          ^
12698 :info:build /opt/local/include/libxml2/unicode/localpointer.h:224:34: warning: rvalue references are a C++11 extension [-Wc++11-extensions]
12699 :info:build     LocalPointer(LocalPointer<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
12700 :info:build                                  ^
12701 :info:build /opt/local/include/libxml2/unicode/localpointer.h:224:40: error: expected ';' at end of declaration list
12702 :info:build     LocalPointer(LocalPointer<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
12703 :info:build                                        ^
12704 :info:build                                        ;
12705 :info:build /opt/local/include/libxml2/unicode/localpointer.h:405:30: warning: rvalue references are a C++11 extension [-Wc++11-extensions]
12706 :info:build     LocalArray(LocalArray<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
12707 :info:build                              ^
12708 :info:build /opt/local/include/libxml2/unicode/localpointer.h:405:36: error: expected ';' at end of declaration list
12709 :info:build     LocalArray(LocalArray<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
12710 :info:build                                    ^
12711 :info:build                                    ;

Same thing as #59587 ?