diff --git a/Source/CPack/cmCPackGenericGenerator.cxx b/Source/CPack/cmCPackGenericGenerator.cxx
index 4f3b96c039..f79db75680 100644
--- a/Source/CPack/cmCPackGenericGenerator.cxx
+++ b/Source/CPack/cmCPackGenericGenerator.cxx
@@ -271,13 +271,6 @@ const char* cmCPackGenericGenerator::GetOption(const char* op)
   return m_MakefileMap->GetDefinition(op);
 }
 
-//----------------------------------------------------------------------
-int cmCPackGenericGenerator::GenerateHeader(std::ostream* os)
-{
-  (void)os;
-  return 1;
-}
-
 //----------------------------------------------------------------------
 int cmCPackGenericGenerator::FindRunningCMake(const char* arg0)
 {
diff --git a/Source/CPack/cmCPackGenericGenerator.h b/Source/CPack/cmCPackGenericGenerator.h
index f9dddc3ba3..f4725da5d9 100644
--- a/Source/CPack/cmCPackGenericGenerator.h
+++ b/Source/CPack/cmCPackGenericGenerator.h
@@ -70,7 +70,6 @@ public:
 protected:
   int PrepareNames();
   int InstallProject();
-  virtual int GenerateHeader(std::ostream* os);
 
   virtual const char* GetOutputExtension() { return "cpack"; }
   virtual const char* GetOutputPostfix() { return 0; }
diff --git a/Source/CPack/cmCPackTGZGenerator.cxx b/Source/CPack/cmCPackTGZGenerator.cxx
index c337e6fc7a..baa612d355 100644
--- a/Source/CPack/cmCPackTGZGenerator.cxx
+++ b/Source/CPack/cmCPackTGZGenerator.cxx
@@ -31,6 +31,16 @@
 #include <fcntl.h>
 #include <errno.h>
 
+//----------------------------------------------------------------------
+class cmCPackTGZGeneratorForward
+{
+  public:
+    static int GenerateHeader(cmCPackTGZGenerator* gg, std::ostream* os)
+      {
+      return gg->GenerateHeader(os);
+      }
+};
+
 //----------------------------------------------------------------------
 cmCPackTGZGenerator::cmCPackTGZGenerator()
 {
@@ -64,8 +74,15 @@ public:
   cmCPackTGZGenerator* Generator;
 };
 
+extern "C" {
+  int cmCPackTGZ_Data_Open(void *client_data, const char* name, int oflags, mode_t mode);
+  ssize_t cmCPackTGZ_Data_Write(void *client_data, void *buff, size_t n);
+  int cmCPackTGZ_Data_Close(void *client_data);
+}
+
+
 //----------------------------------------------------------------------
-int cmCPackTGZGenerator::TGZ_Open(void *client_data, const char* pathname, int, mode_t)
+int cmCPackTGZ_Data_Open(void *client_data, const char* pathname, int, mode_t)
 {
   cmCPackTGZ_Data *mydata = (cmCPackTGZ_Data*)client_data;
 
@@ -79,7 +96,7 @@ int cmCPackTGZGenerator::TGZ_Open(void *client_data, const char* pathname, int,
   gf->SetCompression(true);
   gf->SetCompressionExtraExtension(false);
 
-  if ( !mydata->Generator->GenerateHeader(mydata->OutputStream))
+  if ( !cmCPackTGZGeneratorForward::GenerateHeader(mydata->Generator,mydata->OutputStream))
     {
     return -1;
     }
@@ -87,7 +104,7 @@ int cmCPackTGZGenerator::TGZ_Open(void *client_data, const char* pathname, int,
 }
 
 //----------------------------------------------------------------------
-ssize_t cmCPackTGZGenerator::TGZ_Write(void *client_data, void *buff, size_t n)
+ssize_t cmCPackTGZ_Data_Write(void *client_data, void *buff, size_t n)
 {
   cmCPackTGZ_Data *mydata = (cmCPackTGZ_Data*)client_data;
 
@@ -100,7 +117,7 @@ ssize_t cmCPackTGZGenerator::TGZ_Write(void *client_data, void *buff, size_t n)
 }
 
 //----------------------------------------------------------------------
-int cmCPackTGZGenerator::TGZ_Close(void *client_data)
+int cmCPackTGZ_Data_Close(void *client_data)
 {
   cmCPackTGZ_Data *mydata = (cmCPackTGZ_Data*)client_data;
 
@@ -120,10 +137,10 @@ int cmCPackTGZGenerator::CompressFiles(const char* outFileName, const char* topl
   char pathname[TAR_MAXPATHLEN];
 
   tartype_t gztype = {
-    (openfunc_t)cmCPackTGZGenerator::TGZ_Open,
-    (closefunc_t)cmCPackTGZGenerator::TGZ_Close,
+    (openfunc_t)cmCPackTGZ_Data_Open,
+    (closefunc_t)cmCPackTGZ_Data_Close,
     (readfunc_t)0,
-    (writefunc_t)cmCPackTGZGenerator::TGZ_Write,
+    (writefunc_t)cmCPackTGZ_Data_Write,
     &mydata
   };
 
@@ -173,3 +190,12 @@ int cmCPackTGZGenerator::CompressFiles(const char* outFileName, const char* topl
     }
   return 1;
 }
+
+//----------------------------------------------------------------------
+int cmCPackTGZGenerator::GenerateHeader(std::ostream* os)
+{
+  (void)os;
+  return 1;
+}
+
+
diff --git a/Source/CPack/cmCPackTGZGenerator.h b/Source/CPack/cmCPackTGZGenerator.h
index c536a8e239..1d2b0280c4 100644
--- a/Source/CPack/cmCPackTGZGenerator.h
+++ b/Source/CPack/cmCPackTGZGenerator.h
@@ -18,9 +18,9 @@
 #ifndef cmCPackTGZGenerator_h
 #define cmCPackTGZGenerator_h
 
-
 #include "cmCPackGenericGenerator.h"
-#include "CPack/cmCPackConfigure.h" // for ssize_t
+
+class cmCPackTGZGeneratorForward;
 
 /** \class cmCPackTGZGenerator
  * \brief A generator for TGZ files
@@ -30,6 +30,7 @@
 class cmCPackTGZGenerator : public cmCPackGenericGenerator
 {
 public:
+  friend class cmCPackTGZGeneratorForward;
   cmCPackTypeMacro(cmCPackTGZGenerator, cmCPackGenericGenerator);
 
   /**
@@ -50,10 +51,7 @@ public:
   virtual ~cmCPackTGZGenerator();
 
 protected:
-  static int TGZ_Open(void *client_data, const char* name, int oflags, mode_t mode);
-  static ssize_t TGZ_Write(void *client_data, void *buff, size_t n);
-  static int TGZ_Close(void *client_data);
-
+  virtual int GenerateHeader(std::ostream* os);
   int CompressFiles(const char* outFileName, const char* toplevel,
     const std::vector<std::string>& files);
   virtual const char* GetOutputExtension() { return "tar.gz"; }