cannot open shared object file: No such file or directory

Copied from my answer here: https://stackoverflow.com/a/9368199/485088

Run ldconfig as root to update the cache – if that still doesn’t help, you need to add the path to the file ld.so.conf (just type it in on its own line) or better yet, add the entry to a new file (easier to delete) in directory ld.so.conf.d.