diff --git a/tools/thirdparty/OpenFst/fst/lib/cache.h b/tools/thirdparty/OpenFst/fst/lib/cache.h
index ec00d5a..74ea934 100644
--- a/tools/thirdparty/OpenFst/fst/lib/cache.h
+++ b/tools/thirdparty/OpenFst/fst/lib/cache.h
@@ -129,11 +129,11 @@ class CacheBaseImpl : public VectorFstBaseImpl<S> {
       while (NumStates() <= s)                     // Add state to main cache
         AddState(0);
       if (!VectorFstBaseImpl<S>::GetState(s)) {
-        SetState(s, new S);
+        this->SetState(s, new S);
         if (cache_first_state_id_ != kNoStateId) {  // Forget 1st cached state
           while (NumStates() <= cache_first_state_id_)
             AddState(0);
-          SetState(cache_first_state_id_, cache_first_state_);
+          this->SetState(cache_first_state_id_, cache_first_state_);
           if (cache_gc_) {
             cache_states_.push_back(cache_first_state_id_);
             cache_size_ += sizeof(S) +
@@ -287,7 +287,7 @@ class CacheBaseImpl : public VectorFstBaseImpl<S> {
           (free_recent || !(state->flags & kCacheRecent)) && s != current) {
         cache_size_ -= sizeof(S) + state->arcs.capacity() * sizeof(Arc);
         delete state;
-        SetState(s, 0);
+        this->SetState(s, 0);
         cache_states_.erase(siter++);
       } else {
         state->flags &= ~kCacheRecent;
diff --git a/tools/thirdparty/OpenFst/fst/lib/compose.h b/tools/thirdparty/OpenFst/fst/lib/compose.h
index 24b169f..0783ea5 100644
--- a/tools/thirdparty/OpenFst/fst/lib/compose.h
+++ b/tools/thirdparty/OpenFst/fst/lib/compose.h
@@ -128,7 +128,7 @@ class ComposeFstImplBase : public CacheImpl<A> {
     if (!HasStart()) {
       StateId start = ComputeStart();
       if (start != kNoStateId) {
-        SetStart(start);
+        this->SetStart(start);
       }
     }
     return CacheImpl<A>::Start();
@@ -137,7 +137,7 @@ class ComposeFstImplBase : public CacheImpl<A> {
   Weight Final(StateId s) {
     if (!HasFinal(s)) {
       Weight final = ComputeFinal(s);
-      SetFinal(s, final);
+      this->SetFinal(s, final);
     }
     return CacheImpl<A>::Final(s);
   }
@@ -583,7 +583,7 @@ class ComposeFstImpl : public ComposeFstImplBase<A> {
         AddArc(s, earca, arcb, numepsa > 0, find_input);  // move on epsilon
       }
     }
-    SetArcs(s);
+    this->SetArcs(s);
    }
 
 
diff --git a/tools/thirdparty/OpenFst/fst/lib/const-fst.h b/tools/thirdparty/OpenFst/fst/lib/const-fst.h
index 74f0c91..ebeeb34 100644
--- a/tools/thirdparty/OpenFst/fst/lib/const-fst.h
+++ b/tools/thirdparty/OpenFst/fst/lib/const-fst.h
@@ -119,8 +119,8 @@ ConstFstImpl<A>::ConstFstImpl(const Fst<A> &fst) : nstates_(0), narcs_(0) {
   SetType("const");
   uint64 copy_properties = fst.Properties(kCopyProperties, true);
   SetProperties(copy_properties | kStaticProperties);
-  SetInputSymbols(fst.InputSymbols());
-  SetOutputSymbols(fst.OutputSymbols());
+  this->SetInputSymbols(fst.InputSymbols());
+  this->SetOutputSymbols(fst.OutputSymbols());
   start_ = fst.Start();
 
   // count # of states and arcs
diff --git a/tools/thirdparty/OpenFst/fst/lib/determinize.h b/tools/thirdparty/OpenFst/fst/lib/determinize.h
index 63b96ec..8a2f4dc 100644
--- a/tools/thirdparty/OpenFst/fst/lib/determinize.h
+++ b/tools/thirdparty/OpenFst/fst/lib/determinize.h
@@ -148,7 +148,7 @@ class DeterminizeFstImplBase : public CacheImpl<A> {
     if (!HasStart()) {
       StateId start = ComputeStart();
       if (start != kNoStateId) {
-        SetStart(start);
+        this->SetStart(start);
       }
     }
     return CacheImpl<A>::Start();
@@ -157,7 +157,7 @@ class DeterminizeFstImplBase : public CacheImpl<A> {
   Weight Final(StateId s) {
     if (!HasFinal(s)) {
       Weight final = ComputeFinal(s);
-      SetFinal(s, final);
+      this->SetFinal(s, final);
     }
     return CacheImpl<A>::Final(s);
   }
@@ -293,8 +293,8 @@ class DeterminizeFsaImpl : public DeterminizeFstImplBase<A> {
     for (typename LabelMap::iterator liter = label_map.begin();
          liter != label_map.end();
          ++liter)
-      AddArc(s, liter->first, liter->second);
-    SetArcs(s);
+      this->AddArc(s, liter->first, liter->second);
+    this->SetArcs(s);
   }
 
  private:
diff --git a/tools/thirdparty/OpenFst/fst/lib/factor-weight.h b/tools/thirdparty/OpenFst/fst/lib/factor-weight.h
index 3a2ef85..073a476 100644
--- a/tools/thirdparty/OpenFst/fst/lib/factor-weight.h
+++ b/tools/thirdparty/OpenFst/fst/lib/factor-weight.h
@@ -180,7 +180,7 @@ class FactorWeightFstImpl
       if (s == kNoStateId)
         return kNoStateId;
       StateId start = FindState(Element(fst_->Start(), Weight::One()));
-      SetStart(start);
+      this->SetStart(start);
     }
     return CacheImpl<A>::Start();
   }
@@ -194,9 +194,9 @@ class FactorWeightFstImpl
                  : (Weight) Times(e.weight, fst_->Final(e.state));
       FactorIterator f(w);
       if (w != Weight::Zero() && f.Done())
-        SetFinal(s, w);
+        this->SetFinal(s, w);
       else
-        SetFinal(s, Weight::Zero());
+        this->SetFinal(s, Weight::Zero());
     }
     return CacheImpl<A>::Final(s);
   }
@@ -263,13 +263,13 @@ class FactorWeightFstImpl
         FactorIterator fit(w);
         if (final_only_ || fit.Done()) {
           StateId d = FindState(Element(arc.nextstate, Weight::One()));
-          AddArc(s, Arc(arc.ilabel, arc.olabel, w, d));
+          this->AddArc(s, Arc(arc.ilabel, arc.olabel, w, d));
         } else {
           for (; !fit.Done(); fit.Next()) {
             const pair<Weight, Weight> &p = fit.Value();
             StateId d = FindState(Element(arc.nextstate,
                                           p.second.Quantize(delta_)));
-            AddArc(s, Arc(arc.ilabel, arc.olabel, p.first, d));
+            this->AddArc(s, Arc(arc.ilabel, arc.olabel, p.first, d));
           }
         }
       }
@@ -285,10 +285,10 @@ class FactorWeightFstImpl
         const pair<Weight, Weight> &p = fit.Value();
         StateId d = FindState(Element(kNoStateId,
                                       p.second.Quantize(delta_)));
-        AddArc(s, Arc(0, 0, p.first, d));
+        this->AddArc(s, Arc(0, 0, p.first, d));
       }
     }
-    SetArcs(s);
+    this->SetArcs(s);
   }
 
  private:
diff --git a/tools/thirdparty/OpenFst/fst/lib/map.h b/tools/thirdparty/OpenFst/fst/lib/map.h
index 722aef3..5d56ebe 100644
--- a/tools/thirdparty/OpenFst/fst/lib/map.h
+++ b/tools/thirdparty/OpenFst/fst/lib/map.h
@@ -294,7 +294,7 @@ class MapFstImpl : public CacheImpl<B> {
 
   StateId Start() {
     if (!HasStart())
-      SetStart(FindOState(fst_->Start()));
+      this->SetStart(FindOState(fst_->Start()));
     return CacheImpl<B>::Start();
   }
 
@@ -306,24 +306,24 @@ class MapFstImpl : public CacheImpl<B> {
           B final_arc = (*mapper_)(A(0, 0, fst_->Final(FindIState(s)),
                                         kNoStateId));
           CHECK(final_arc.ilabel == 0 && final_arc.olabel == 0);
-          SetFinal(s, final_arc.weight);
+          this->SetFinal(s, final_arc.weight);
           break;
         }
         case MAP_ALLOW_SUPERFINAL: {
           if (s == superfinal_) {
-            SetFinal(s, Weight::One());
+            this->SetFinal(s, Weight::One());
           } else {
             B final_arc = (*mapper_)(A(0, 0, fst_->Final(FindIState(s)),
                                           kNoStateId));
             if (final_arc.ilabel == 0 && final_arc.olabel == 0)
-              SetFinal(s, final_arc.weight);
+              this->SetFinal(s, final_arc.weight);
             else
-              SetFinal(s, Weight::Zero());
+              this->SetFinal(s, Weight::Zero());
           }
           break;
         }
         case MAP_REQUIRE_SUPERFINAL: {
-          SetFinal(s, s == superfinal_ ? Weight::One() : Weight::Zero());
+          this->SetFinal(s, s == superfinal_ ? Weight::One() : Weight::Zero());
           break;
         }
       }
@@ -357,14 +357,14 @@ class MapFstImpl : public CacheImpl<B> {
 
   void Expand(StateId s) {
     // Add exiting arcs.
-    if (s == superfinal_) { SetArcs(s); return; }
+    if (s == superfinal_) { this->SetArcs(s); return; }
 
     for (ArcIterator< Fst<A> > aiter(*fst_, FindIState(s));
          !aiter.Done(); aiter.Next()) {
       A aarc(aiter.Value());
       aarc.nextstate = FindOState(aarc.nextstate);
       const B& barc = (*mapper_)(aarc);
-      AddArc(s, barc);
+      this->AddArc(s, barc);
     }
 
     // Check for superfinal arcs.
@@ -380,7 +380,7 @@ class MapFstImpl : public CacheImpl<B> {
             if (superfinal_ == kNoStateId)
               superfinal_ = nstates_++;
             final_arc.nextstate = superfinal_;
-            AddArc(s, final_arc);
+            this->AddArc(s, final_arc);
           }
           break;
         }
@@ -389,12 +389,12 @@ class MapFstImpl : public CacheImpl<B> {
                                       kNoStateId));
         if (final_arc.ilabel != 0 || final_arc.olabel != 0 ||
             final_arc.weight != B::Weight::Zero())
-          AddArc(s, B(final_arc.ilabel, final_arc.olabel,
+          this->AddArc(s, B(final_arc.ilabel, final_arc.olabel,
                       final_arc.weight, superfinal_));
         break;
       }
     }
-    SetArcs(s);
+    this->SetArcs(s);
   }
 
  private:
diff --git a/tools/thirdparty/OpenFst/fst/lib/vector-fst.h b/tools/thirdparty/OpenFst/fst/lib/vector-fst.h
index 8e99521..5950e6f 100644
--- a/tools/thirdparty/OpenFst/fst/lib/vector-fst.h
+++ b/tools/thirdparty/OpenFst/fst/lib/vector-fst.h
@@ -197,9 +197,9 @@ class VectorFstImpl : public VectorFstBaseImpl< VectorState<A> > {
 
   static VectorFstImpl<A> *Read(istream &strm, const FstReadOptions &opts);
 
-  size_t NumInputEpsilons(StateId s) const { return GetState(s)->niepsilons; }
+  size_t NumInputEpsilons(StateId s) const { return this->GetState(s)->niepsilons; }
 
-  size_t NumOutputEpsilons(StateId s) const { return GetState(s)->noepsilons; }
+  size_t NumOutputEpsilons(StateId s) const { return this->GetState(s)->noepsilons; }
 
   bool Write(ostream &strm, const FstWriteOptions &opts) const;
 
@@ -211,7 +211,7 @@ class VectorFstImpl : public VectorFstBaseImpl< VectorState<A> > {
   }
 
   void SetFinal(StateId s, Weight w) {
-    Weight ow = Final(s);
+    Weight ow = this->Final(s);
     if (ow != Weight::Zero() && ow != Weight::One())
       SetProperties(Properties() & ~kWeighted);
     BaseImpl::SetFinal(s, w);
@@ -230,7 +230,7 @@ class VectorFstImpl : public VectorFstBaseImpl< VectorState<A> > {
   }
 
   void AddArc(StateId s, const A &arc) {
-    VectorState<A> *state = GetState(s);
+    VectorState<A> *state = this->GetState(s);
     if (arc.ilabel != arc.olabel) {
       SetProperties(Properties() | kNotAcceptor);
       SetProperties(Properties() & ~kAcceptor);
@@ -288,21 +288,21 @@ class VectorFstImpl : public VectorFstBaseImpl< VectorState<A> > {
   }
 
   void DeleteArcs(StateId s, size_t n) {
-    const vector<A> &arcs = GetState(s)->arcs;
+    const vector<A> &arcs = this->GetState(s)->arcs;
     for (size_t i = 0; i < n; ++i) {
       size_t j = arcs.size() - i - 1;
       if (arcs[j].ilabel == 0)
-        --GetState(s)->niepsilons;
+        --this->GetState(s)->niepsilons;
       if (arcs[j].olabel == 0)
-        --GetState(s)->noepsilons;
+        --this->GetState(s)->noepsilons;
     }
     BaseImpl::DeleteArcs(s, n);
     SetProperties(Properties() & kDeleteArcsProperties);
   }
 
   void DeleteArcs(StateId s) {
-    GetState(s)->niepsilons = 0;
-    GetState(s)->noepsilons = 0;
+    this->GetState(s)->niepsilons = 0;
+    this->GetState(s)->noepsilons = 0;
     BaseImpl::DeleteArcs(s);
     SetProperties(Properties() & kDeleteArcsProperties);
   }
@@ -322,8 +322,8 @@ template <class A>
 VectorFstImpl<A>::VectorFstImpl(const Fst<A> &fst) {
   SetType("vector");
   SetProperties(fst.Properties(kCopyProperties, false) | kStaticProperties);
-  SetInputSymbols(fst.InputSymbols());
-  SetOutputSymbols(fst.OutputSymbols());
+  this->SetInputSymbols(fst.InputSymbols());
+  this->SetOutputSymbols(fst.OutputSymbols());
   BaseImpl::SetStart(fst.Start());
 
   for (StateIterator< Fst<A> > siter(fst);
@@ -332,16 +332,16 @@ VectorFstImpl<A>::VectorFstImpl(const Fst<A> &fst) {
     StateId s = siter.Value();
     BaseImpl::AddState();
     BaseImpl::SetFinal(s, fst.Final(s));
-    ReserveArcs(s, fst.NumArcs(s));
+    this->ReserveArcs(s, fst.NumArcs(s));
     for (ArcIterator< Fst<A> > aiter(fst, s);
          !aiter.Done();
          aiter.Next()) {
       const A &arc = aiter.Value();
       BaseImpl::AddArc(s, arc);
       if (arc.ilabel == 0)
-        ++GetState(s)->niepsilons;
+        ++this->GetState(s)->niepsilons;
       if (arc.olabel == 0)
-        ++GetState(s)->noepsilons;
+        ++this->GetState(s)->noepsilons;
     }
   }
 }
@@ -427,7 +427,7 @@ bool VectorFstImpl<A>::Write(ostream &strm,
     return false;
 
   for (StateId s = 0; s < NumStates(); ++s) {
-    const VectorState<A> *state = GetState(s);
+    const VectorState<A> *state = this->GetState(s);
     state->final.Write(strm);
     int64 narcs = state->arcs.size();
     WriteType(strm, narcs);