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Finding Shared Libraries at Run-time

The dynamic linker searches for shared libraries in the following order:

1. If LD_LIBRARY_PATH is defined, then each of the colon-separated directories listed in its value is searched in turn.
   
   
2. /etc/ld.so.cache is checked to see if it contains an entry for the library.
   
   
3. /lib and /usr/lib are searched (in that order).

(C) 2006, Michael Kerrisk