Did you build sage from source? I had success getting lrslib to build by 
running:

CFLAGS=-Wno-implicit-function-declaration make lrslib

if you didn't build from source then you might try

CFLAGS=-Wno-implicit-function-declaration sage -i lrslib

On Thursday, January 14, 2021 at 2:01:36 PM UTC-5, Lisa Marie wrote:
>
> Hi,
>
> thanks for the quick help.
>
> I'm not really familiar with compiler flags. Could you specify your answer 
> a bit? Would be really helpful for me!
>
> Regards, Lisa
>
> [email protected] schrieb am Donnerstag, 14. Januar 2021 um 17:38:17 UTC+1:
>
>> the problem is that the compiler in XCode 12 has unreasonable assumptions 
>> about C/C++ code.
>> This most probably can be fixed by setting appropriate compiler flags. 
>> See the relevant to XCode   12 and macOS 11 tickets on trac.sagemath.org
>>
>>
>>
>> On Thu, 14 Jan 2021, 15:38 Lisa Marie, <[email protected]> wrote:
>>
>>> Hey everybody,
>>>
>>> I have a problem with installing the 
>>> package lrslib-062+autotools-2017-03-03.p1 for sage. I work on an Macbook 
>>> with an Intelprocessor and MacOSX Big Sur, 11.1. I also installed every 
>>> package recommended for sage. 
>>>
>>> Can you help me fix the problem or at least say what the problem is?
>>>
>>> The log-file of the problem is appended.
>>>
>>> Thanks for helping!
>>> Lisa
>>>
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>>>
>>

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