QT Compile Error

tools\qdatetime.cpp: In function 'QDateTimePrivate::Spec utcToLocal(QDate&, QTime&)':
tools\qdatetime.cpp:4071:57: error: 'localtime_r' was not declared in this scope
     brokenDown = localtime_r(&secsSince1Jan1970UTC, &res);
                                                         ^
tools\qdatetime.cpp: In function 'void localToUtc(QDate&, QTime&, int)':
tools\qdatetime.cpp:4175:54: error: 'gmtime_r' was not declared in this scope
     brokenDown = gmtime_r(&secsSince1Jan1970UTC, &res);
                                                      ^
Makefile.Debug:10785: recipe for target 'tmp/obj/debug_shared/qdatetime.o' failed
mingw32-make[2]: *** [tmp/obj/debug_shared/qdatetime.o] Error 1
mingw32-make[2]: Leaving directory 'C:/Qt/4.8.5/src/corelib'
Makefile:34: recipe for target 'debug' failed
mingw32-make[1]: *** [debug] Error 2
mingw32-make[1]: Leaving directory 'C:/Qt/4.8.5/src/corelib'
Makefile:1149: recipe for target 'sub-corelib-sub_Debug' failed
mingw32-make: *** [sub-corelib-sub_Debug] Error 2