Marius Bakke <mbakke@fastmail.com> writes:

> Leo Famulari <leo@famulari.name> writes:
>
> [...]
>
>> In gnu/packages/mes.scm:
>>   79: 1 [native-inputs]
>> In unknown file:
>>    ?: 0 [string-prefix? #f "x86_64-linux" ...]
>>
>> ERROR: In procedure string-prefix?:
>> ERROR: In procedure string-prefix?: Wrong type argument in position 1 (expecting string): #f
>
> This seems to be because system is not x86_64, and
> (%current-target-system) evaluates to false. I *think* the attached
> patch solves it.

I pushed a one-liner variant. Can you try restarting the evaluation?