[ndnSIM] error of "./waf --run=ndn-simple --vis"

[任沛]

Hello all,

When we are compiling ndnSIM successfully while try the example "./waf --run=ndn-simple --vis" , some error occur as show in figure, i can not run command line with "--vis" while runing "./waf --run=ndn-simple", it's success, who can tell me how can i solve this problem?

Thanks

pei ren
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