libsqlplus.so: cannot open shared object file: No such file or directory

Recently I had to install SQL*Plus on a Linux host. In order to do so, I downloaded the appropriate Oracle Instant Client packages from the Oracle site. For my installation, I chose the ZIP files. After I unzipped the client and tried to run sqlplus, I go the following error:

simon@pandora instantclient_11_2$ ./sqlplus
./sqlplus: error while loading shared libraries: libsqlplus.so: cannot open shared object file: No such file or directory

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