Translate the following English sentence to French:
"A technical improvement in the flexibility system will not be enough: we also have to raise the issue of developing our institutions for the countries in the vanguard as proposed by Jacques Delors, for example."
L'amélioration technique du système des flexibilités ne suffira pas, mais il va falloir également parler du développement des institutions propres des pays d'avant-garde, proposé entre autres par M. Delors.