Redirected the sage/local/lib/libreadline.so.6 link to the system library, 
/lib64/libreadline.so.6.3.
Problem solved. Sage 8.1.beta3 now reports "All tests passed!".

Thanks for your help!
 - Richard

On Wednesday, August 30, 2017 at 12:54:59 AM UTC-7, Emmanuel Charpentier 
wrote:
>
> You might try to move one of them out of the way and replace it by (a link 
> to ?) the other, to see what happens
>
>    - when you use Sage
>    - when you use some software on your system using libreadline
>
>
> The result(s) may help to determine the "right" tqrget for debugging the 
> problem.
>
> HTH,
>
> --
> Emmanuel Charpentier
>
> Le mercredi 30 août 2017 00:27:14 UTC+2, [email protected] a écrit :
>>
>> Thanks, Emmanuel.
>>
>> Indeed, ldconfig -p gives the following: "libreadline.so.6 (libc6,x86-64) 
>> => /lib64/libreadline.so.6". The latter is a symbolic link to 
>> /lib64/libreadline.so.6.3, owned by root.
>> In the folder ~/Development/sage/local/lib/, ./libreadline.so.6 is a 
>> symbolic link to ./libreadline.so.6.3 (owned by rllozes), as expected.
>>
>> So, I have two symlinks, both presumably visible(?) and both pointing to 
>> valid, versioned libraries. How would that confuse the make? I don't find 
>> any other similarly named files. 
>>
>>  - Richard
>>
>> On Tuesday, August 29, 2017 at 6:11:30 AM UTC-7, Emmanuel Charpentier 
>> wrote:
>>>
>>> In the three cases, the culprit is the unexpected message :
>>>
>>> sh: /home/rllozes/Development/sage/local/lib/libreadline.so.6: no version 
>>> information available (required by sh)
>>>
>>>
>>> Do you have an unexpected libreadline in your library path ?
>>>
>>>  ...
>>>
>>

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