You need the "unprefixed libgap" where the symbols are not 
prefixed. https://trac.sagemath.org/ticket/19915 



On Tuesday, November 22, 2016 at 11:22:02 PM UTC+1, Nicolas M. Thiéry wrote:
>
>        Dear Volker, Dima, Markus, 
>
> For my research, I and several persons in the same area would really 
> need to use GAP's Semigroups package in Sage to avoid reimplementing 
> equivalent stuff in Sage. Semigroups depends on IO, which itself 
> requires dynamic loading which, as Dima mentioned a couple times 
> recently, is currently not possible with libgap: 
>
>     sage: libgap.LoadPackage("IO") 
>     ... 
>     ValueError: libGAP: Error, no support for dynamic loading 
>
> I remember discussing this briefly with Volker in St Andrews. And then 
> later, for some time, I have been able to use Semigroups in 
> libgap. But not anymore. Alas I did not take notes on what Volker had 
> said, and if I had taken any action following that discussion, or if 
> it was plain luck. 
>
> - Is this something structural to libgap? 
> - Is there a fix? a work around? 
>
> Thanks in advance! 
>
> Cheers, 
>                 Nicolas 
> -- 
> Nicolas M. Thiéry "Isil" <nth...@users.sf.net <javascript:>> 
> http://Nicolas.Thiery.name/ 
>

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