qmacstyle_mac.mm fails to compile with 32-bit mkspec

styles/qmacstyle_mac.mm:3828:45: error: non-constant-expression cannot 
be narrowed from type 'qreal' (aka 'double') to 'CGFloat' (aka 'float') in initializer list [-Wc++11-narrowing]
                     CGFloat colorComp[] = { textColor.redF(), textColor.greenF(),
                                             ^~~~~~~~~~~~~~~~

styles/qmacstyle_mac.mm:5021:28: error: no viable conversion from 'NSRect' (aka '_NSRect') to 'CGRect'
                    CGRect rect = [scroller bounds];
                           ^      ~~~~~~~~~~~~~~~~~
/System/Library/Frameworks/ApplicationServices.framework/Headers/../Frameworks/CoreGraphics.framework/Headers/CGGeometry.h:29:8: note: 
      candidate constructor (the implicit copy constructor) not viable: no known conversion from 'NSRect' (aka '_NSRect')
      to 'const CGRect &' for 1st argument;
struct CGRect {
       ^