configure fails on Arch Linux, complains about struct statx redeclaration etc.

$ rm -rf * .*; ../qt5/configure -developer-build -debug  -nomake examples -nomake tests -opensource -confirm-license
....
Creating qmake...
In file included from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:94:
/usr/include/linux/stat.h:56:8: error: redefinition of ‘struct statx_timestamp’
 struct statx_timestamp {
        ^~~~~~~~~~~~~~~
In file included from /usr/include/sys/stat.h:446,
                 from /home/rutledge/dev/qt5/qtbase/mkspecs/linux-g++/qplatformdefs.h:75,
                 from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:42:
/usr/include/bits/statx.h:25:8: note: previous definition of ‘struct statx_timestamp’
 struct statx_timestamp
        ^~~~~~~~~~~~~~~
In file included from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:94:
/usr/include/linux/stat.h:99:8: error: redefinition of ‘struct statx’
 struct statx {
        ^~~~~
In file included from /usr/include/sys/stat.h:446,
                 from /home/rutledge/dev/qt5/qtbase/mkspecs/linux-g++/qplatformdefs.h:75,
                 from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:42:
/usr/include/bits/statx.h:36:8: note: previous definition of ‘struct statx’
 struct statx
        ^~~~~
/home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:110:12: error: ‘int renameat2(int, const char*, int, const char*, unsigned int)’ was declared ‘extern’ and later ‘static’ [-fpermissive]
 static int renameat2(int oldfd, const char *oldpath, int newfd, const char *newpath, unsigned flags)
            ^~~~~~~~~
In file included from /usr/include/c++/8.2.0/cstdio:42,
                 from /usr/include/c++/8.2.0/ext/string_conversions.h:43,
                 from /usr/include/c++/8.2.0/bits/basic_string.h:6391,
                 from /usr/include/c++/8.2.0/string:52,
                 from ../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qbytearray.h:52,
                 from ../include/QtCore/qbytearray.h:1,
                 from ../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qstring.h:49,
                 from ../include/QtCore/qstring.h:1,
                 from ../include/QtCore/../../../../qt5/qtbase/src/corelib/io/qiodevice.h:50,
                 from ../include/QtCore/qiodevice.h:1,
                 from ../include/QtCore/../../../../qt5/qtbase/src/corelib/io/qfiledevice.h:43,
                 from ../include/QtCore/qfiledevice.h:1,
                 from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfile.h:44,
                 from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_p.h:54,
                 from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:43:
/usr/include/stdio.h:164:12: note: previous declaration of ‘int renameat2(int, const char*, int, const char*, unsigned int)’
 extern int renameat2 (int __oldfd, const char *__old, int __newfd,
            ^~~~~~~~~
/home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:115:12: error: ‘int statx(int, const char*, int, unsigned int, statx*)’ was declared ‘extern’ and later ‘static’ [-fpermissive]
 static int statx(int dirfd, const char *pathname, int flag, unsigned mask, struct statx *statxbuf)
            ^~~~~
In file included from /usr/include/sys/stat.h:446,
                 from /home/rutledge/dev/qt5/qtbase/mkspecs/linux-g++/qplatformdefs.h:75,
                 from /home/rutledge/dev/qt5/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:42:
/usr/include/bits/statx.h:87:5: note: previous declaration of ‘int statx(int, const char*, int, unsigned int, statx*)’
 int statx (int __dirfd, const char *__restrict __path, int __flags,
     ^~~~~
make: *** [Makefile:423: qfilesystemengine_unix.o] Error 1