port -u upgrade outdated

hi :-) when i do port -u upgrade outdated i get a lot of errors like ---> Unable to uninstall xxxx, the following ports depend on it: ... Error: Uninstall xxxx failed: Please uninstall the ports that depend on fontconfig first. but, this command is supposed to know how to update while making the things in the good order, isn't it ?? -- j'agis contre l'assistanat, je travaille dans une SCOP !