qt-4.8.5 fails to build on MIPS64

../3rdparty/javascriptcore/JavaScriptCore/runtime/JSValue.h: In constructor 'QTJSC::JSValue::JSValue(QTJSC::JSCell*)':
../3rdparty/javascriptcore/JavaScriptCore/runtime/JSValue.h:494:57: error: cast from 'QTJSC::JSCell*' to 'int32_t

{aka int}' loses precision [-fpermissive]
../3rdparty/javascriptcore/JavaScriptCore/runtime/JSValue.h: In constructor 'QTJSC::JSValue::JSValue(const QTJSC::JSCell*)':
../3rdparty/javascriptcore/JavaScriptCore/runtime/JSValue.h:506:78: error: cast from 'QTJSC::JSCell*' to 'int32_t {aka int}

' loses precision [-fpermissive]

This bug looks very similar to this one:

https://bugreports.qt-project.org/browse/QTBUG-6948