Solaris/gcc 4.8: QLockFile fails to compile

io/qlockfile_unix.cpp: In static member function 'static int QLockFilePrivate::checkFcntlWorksAfterFlock()':
io/qlockfile_unix.cpp:87:19: error: 'LOCK_EX' was not declared in this scope
if (flock(fd, LOCK_EX | LOCK_NB) == -1) // other threads, and other processes on a local fs
io/qlockfile_unix.cpp:87:29: error: 'LOCK_NB' was not declared in this scope
if (flock(fd, LOCK_EX | LOCK_NB) == -1) // other threads, and other processes on a local fs
io/qlockfile_unix.cpp: In function 'bool setNativeLocks(int)':
io/qlockfile_unix.cpp:119:19: error: 'LOCK_EX' was not declared in this scope
if (flock(fd, LOCK_EX | LOCK_NB) == -1) // other threads, and other processes on a local fs
io/qlockfile_unix.cpp:119:29: error: 'LOCK_NB' was not declared in this scope
if (flock(fd, LOCK_EX | LOCK_NB) == -1) // other threads, and other processes on a local fs