installing config.h

[Waldemar Rosenbach]

config.h is platform depend, so it shouldn't be installed by make install.
But what is the best way to deal with the platform depend stuff in the 
interface?

For example:

#ifdef HAVE_HASHMAP
#   include <hash_map>
   typedef std::hash_map<string, int> myTableType;
#else
#   include <map>
   typedef std::map<string, int> myTableType;
#endif

myTableType container;

another example:

#ifdef _POSIX_C_SOURCE
  typedef pthread_t iThreadID;
  typedef pthread_t iThreadHandle;
#endif

#ifdef USE_SPROC
  typedef pid_t iThreadID;
  typedef pid_t iThreadHandle;
#endif

#ifdef WIN32
  typedef DWORD  iThreadID;
  typedef HANDLE iThreadHandle;
#endif


The symbols are defined or not in the config.h, thus I have to include 
it in the header and then to install.
The other way is to define a wrapper-class and use pointers to this 
class, but this is cumbersomely.
Is there another way to solve this kind of problem?