"Has different visibility" warnings when building static on Mac Cocoa

A whole lot of warnings like these are shown during build:

ld warning: QList<QTextEdit::ExtraSelection>::free(QListData::Data*) has different visibility (hidden) in /home/cs/qt/mac/qt-mac-commercial-src-4.5.0.002/lib/libQtGui.a(qtextcontrol.o) and (default) in html-background-color.o
ld warning: QList<QTextEdit::ExtraSelection>::detach_helper() has different visibility (hidden) in /home/cs/qt/mac/qt-mac-commercial-src-4.5.0.002/lib/libQtGui.a(qtextcontrol.o) and (default) in html-background-color.o
ld warning: QList<QTextEdit::ExtraSelection>::~QList() has different visibility (hidden) in /home/cs/qt/mac/qt-mac-commercial-src-4.5.0.002/lib/libQtGui.a(qtextcontrol.o) and (default) in html-background-color.o
ld warning: QList<QTextEdit::ExtraSelection>::~QList() has different visibility (hidden) in /home/cs/qt/mac/qt-mac-commercial-src-4.5.0.002/lib/libQtGui.a(qtextcontrol.o) and (default) in html-background-color.o
ld warning: QList<QTextEdit::ExtraSelection>::append(QTextEdit::ExtraSelection const&)has different visibility (hidden) in /home/cs/qt/mac/qt-mac-commercial-src-4.5.0.002/lib/libQtGui.a(qtextcontrol.o) and (default) in html-background-color.o