+++++++++++++++++++++++++++++++
 ldd -v /opt/perl/ActivePerl-5.20/lib/auto/DBD/Oracle/Oracle.so
        linux-vdso.so.1 =>  (0x00007fffd4f00000)
        libclntsh.so.12.1 => not found
        libc.so.6 => /lib64/libc.so.6 (0x00007f9d49947000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f9d49f4e000)

        Version information:
        /opt/perl/ActivePerl-5.20/lib/auto/DBD/Oracle/Oracle.so:
                libc.so.6 (GLIBC_2.4) => /lib64/libc.so.6
                libc.so.6 (GLIBC_2.14) => /lib64/libc.so.6
                libc.so.6 (GLIBC_2.3.4) => /lib64/libc.so.6
                libc.so.6 (GLIBC_2.2.5) => /lib64/libc.so.6
        /lib64/libc.so.6:
                ld-linux-x86-64.so.2 (GLIBC_2.3) => /lib64/ld-linux-x86-64.so.2
                ld-linux-x86-64.so.2 (GLIBC_PRIVATE) => /lib64/ld-linux-x86-64.so.2
+++++++++++++++++++++++++++++++++