/usr/local/maildrop-1.6.3# ldd `which maildrop`
        libgdbm.so.3 => /usr/local/lib/libgdbm.so.3 (0x4001a000)
        libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x4001f000)
        libm.so.6 => /lib/libm.so.6 (0x400d8000)
        libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x400fb000)
        libc.so.6 => /lib/libc.so.6 (0x40104000)
        /lib/ld-linux.so.2 (0x40000000)