Get things to compile with gcc-7.

src/service/common/translation_service.h

@@ -77,7 +77,7 @@ public:
       // callback() is not static, so we must wrap it in a lambda:
       auto cb = [=](Ptr<History const> h) { this->callback_(h); };
       auto w = New<TranslationWorker>(d, vocabs_, slgen_, jq_, cb, options_);
-      w->start<Search>();
+      w->template start<Search>();
       workers_.push_back(w);
     }
   }

src/service/rest/rest_server.cpp

@@ -173,7 +173,7 @@ int main(int argc, char* argv[])
 
   auto options = cp.parseOptions(argc, argv, true);
   auto service = New<tservice_t>(options);
-  service->start<BeamSearch>();
+  service->template start<BeamSearch>();
 
   crow::SimpleApp app;
   std::string doc_root = options->get<std::string>("server-root");