Several submodules failed to compile because of this same reason:

c:\Users\qt\work\install\include/QtCore/qstringlist.h:49:35: fatal error: QtCore/qstringmatcher.h: No such file or directory
In file included from c:\Users\qt\work\install\include/QtCore/qlist.h:1094:0,
from c:\Users\qt\work\install\include/QtCore/qstringlist.h:41,
from c:\Users\qt\work\install\include/QtGui/qcolor.h:46,
from c:\Users\qt\work\install\include/QtGui/qpixmap.h:45,
from c:\Users\qt\work\install\include/QtGui/qpainter.h:48,
from qsvgstyle_p.h:54,
from qsvgnode_p.h:54,
from qsvggraphics_p.h:54,
from qsvggraphics.cpp:40:
c:\Users\qt\work\install\include/QtCore/qstringlist.h:49:35: fatal error: QtCore/qstringmatcher.h: No such file or directory
Makefile.Debug:572: recipe for target '.obj/debug/qsvggraphics.o' failed
Mingw32-make[3]: *** [.obj/debug/qsvggraphics.o] Error 1
Makefile.Release:572: recipe for target '.obj/release/qsvggraphics.o' failed
Mingw32-make[3]: *** [.obj/release/qsvggraphics.o] Error 1
Mingw32-make[2]: *** [debug-all] Error 2
Mingw32-make[2]: *** [release-all] Error 2
Mingw32-make[1]: *** [sub-svg-make_first-ordered] Error 2
Mingw32-make: *** [sub-src-make_first] Error 2

Build log: https://testresults.qt.io/logs/qt/qtsvg/4f71b95dfec13361bbda6325be8a64351e991d08/WindowsWindows_7x86WindowsWindows_7x86Mingw53qtci-windows-7-x86-2-219cf1DebugAndRelease_Release_OpenGLDynamic_DisableTests/1e6c437814e1729e8ff24292cef1524e105f7778/build_1504123459/buildlog.txt.gz

Details: https://testresults.qt.io/coin/integration/qt/qt5/tasks/1504123177

Failure at least in

   - qt/qtactiveqt
   - qt/qtimageformats
   - qt/qtserialport
   - qt/qtsvg