In GCC 4.6 the compiler no longer allows objects of const-qualified type to
be default initialized unless the type has a user-declared default
constructor.

Patch from Gentoo bugzilla: http://bugs.gentoo.org/show_bug.cgi?id=358021

Gentoo Bugzilla description follows:
"If a class or struct has no user-defined default constructor, C++ doesn't
allow you to default construct a const instance of it.

https://bugs.gentoo.org/358021
http://clang.llvm.org/compatibility.html#default_init_const
http://gcc.gnu.org/PR44499"

--- a/jade/TeXFOTBuilder.cxx
+++ b/jade/TeXFOTBuilder.cxx
@@ -88,6 +88,8 @@ public:
       value.convertString(nic_.placement);
       }
     ExtensionFlowObj *copy() const { return new PageFloatFlowObj(*this); }
+  public:
+    PageFloatFlowObj() {}
   private:
     PageFloatNIC nic_;
     StringC name_;
@@ -101,6 +103,8 @@ public:
       fotb.endPageFootnote();
     }
     ExtensionFlowObj *copy() const { return new PageFootnoteFlowObj(*this); }
+  public:
+    PageFootnoteFlowObj() {}
   private:
   };
   //////////////////////////////////////////////////////////////////////
--- a/jade/TransformFOTBuilder.cxx
+++ b/jade/TransformFOTBuilder.cxx
@@ -41,6 +41,7 @@ public:
   };
   class EntityRefFlowObj : public TransformExtensionFlowObj {
   public:
+    EntityRefFlowObj() {}
     void atomic(TransformFOTBuilder &fotb, const NodePtr &) const {
       fotb.entityRef(name_);
     }
@@ -56,6 +57,7 @@ public:
   };
   class ProcessingInstructionFlowObj : public TransformExtensionFlowObj {
   public:
+    ProcessingInstructionFlowObj() {}
     void atomic(TransformFOTBuilder &fotb, const NodePtr &) const {
       fotb.processingInstruction(data_);
     }
@@ -98,6 +100,8 @@ public:
       }
     }
     ExtensionFlowObj *copy() const { return new EmptyElementFlowObj(*this); }
+  public:
+    EmptyElementFlowObj() {}
   private:
     ElementNIC nic_;
   };
@@ -133,6 +137,8 @@ public:
       }
     }
     ExtensionFlowObj *copy() const { return new ElementFlowObj(*this); }
+  public:
+    ElementFlowObj() {}
   private:
     ElementNIC nic_;
   };
@@ -150,6 +156,8 @@ public:
       value.convertString(systemId_);
     }
     ExtensionFlowObj *copy() const { return new EntityFlowObj(*this); }
+  public:
+    EntityFlowObj() {}
   private:
     StringC systemId_;
   };
@@ -174,6 +182,8 @@ public:
       }
     }
     ExtensionFlowObj *copy() const { return new DocumentTypeFlowObj(*this); }
+  public:
+    DocumentTypeFlowObj() {}
   private:
     DocumentTypeNIC nic_;
   };