[ndnSIM] 'protobuf' not found (when porting NLSR)

[siqi wang]

Hi everybody,
I am currently trying to port NLSR into ndnSIM and follow instructions from
https://github.com/3rd-ndn-hackathon/ndnSIM-NLSR/blob/master/PORTING.md

However, the following error is obtained when I configure (./waf configure
--enable-examples --enable-nlsr) :
Checking for 'protobuf'                                 : not found
The configuration failed

Is there any supporting for this problem? Thank you very much.
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