problem with ld-elf.so.1

[hymette at wanadoo.fr]

Hi,

I've been upgrading from 4.7 to 4.9 recently. Unfortunately I forgot to 
make world for a while , after having cvsuped (sys and ports). In the 
meantime I installed several ports and things were not going too bad , 
but in some cases I had to ignore error messages (e.g. with Qt). It's 
after having tried to ugdate pkgconfig without success that I realized 
my errors. The port refuse to install and several applications that use 
ld-elf.so.1 abort complaining "Shared object lib***.so.4 not found", 
where *** can be "SDL", "intl", for instance.

Now I used "make world" correctly but this failure persists. I'm afraid 
many ports won't work well or even install. What can I do?

Thank you in advance and merry Christmas!