However, they did not drive out the Canaanites who lived in Gezer, so the Canaanites have lived in the midst of Ephraim to this day but have been made to do forced labor.
Joshua 16:10

If Ephraim had succeeded in driving out the Gezerites, would Dan have had such a hard time taking control of their territory? Failures in any one tribe overflowed into the others. Eventually the Gezerites were completely absorbed into Israel.