Can't compile Qt 5.2 on FreeBSD

In file qdatetime.cpp function static int qt_timezone() :

static int qt_timezone()
{
#if defined(Q_OS_WINCE)
...
#elif defined(_MSC_VER) && _MSC_VER >= 1400
...
#else
return timezone;
^^^^^^^^^^^^^^^^
#endif // Q_OS_WIN
}

This is correct on Linux, but on FreeBSD timezone is not variable, it's function defined in /usr/src/include/time.h:

char *timezone(int, int);