[root@localhost ~]# cd /usr/local/lib I had built and installed a non-system readline library as root in /usr/local/lib . As far as I can tell, the system readline library is in the file: /lib64/libreadline.so.6.0 Running # ldd -d -r /lib64/libreadline.so.6.0 linux-vdso.so.1 => (0x00007ffd0139b000) libtinfo.so.5 => /lib64/libtinfo.so.5 (0x0000003e73200000) libc.so.6 => /lib64/libc.so.6 (0x0000003752000000) /lib64/ld-linux-x86-64.so.2 (0x0000003751c00000) gives no unresolved… Continue reading This guy has my vote: libreadline cleanup