ld ? ldd ? please help

[Danny Tiberman <tiberman@macbeth.ls.huji.ac.il>]

Hello

When I do /sbin/ldconfig -v | grep libtk I get :
libtk8.4.so.0 ---> libtk8.4.so.0

but when I run ldd executable i get:

libtk8.4.so --> not found

Please Help I have never done this before.

Thanks In Advance