Qt WebEngine Recipe do_install_append()

Hello,

I found these lines in the Qt WebEngine 5.5 and 5.6 Recipe

/do_install_append() {//
// rmdir ${D}${OE_QMAKE_PATH_PLUGINS}/${BPN} ${D}${OE_QMAKE_PATH_PLUGINS} || true//
// sed -i 's@ -Wl,--start-group.*-Wl,--end-group@@g; s@-L${B}[^ ]* @ @g' ${D}${libdir}/pkgconfig/Qt5WebEngineCore.pc//
// }//
/
Version 5.5 compile without problem. However, to make Qt Web Engine compile for 5.6, I needed to delete these lines. But, qtwebengine-qmlplugins, qtwebengine-plugins, and qtwebengine-examples are all gone from the build (from 5.6). These lines return error in which the system cannot access those directories.

Could someone explain what do they mean? especially the sed one. What happened to the Qtwebengine plugins, qmlplugins and examples in Qt WebEngine 5.6?

Thank you,

Charles Chau