Typedefs starting with `q' in bsd/hfs/hfscommon/headers/system

• QElem bsd/hfs/hfscommon/headers/system/MacOSStubs.h:379
• QElemPtr bsd/hfs/hfscommon/headers/system/MacOSStubs.h:381
• QHdrPtr bsd/hfs/hfscommon/headers/system/MacOSStubs.h:389