It seems that 'dbCameraExist' is missing from the header files. It was added for latest vs2005, I hope it is still found in vs2008.
Here is a list of missing definitions, including dbCameraExist:
(Source: Jason p sage)
//----------------------------------------------------------------------------
// DarkGDK Missing Declarations
//----------------------------------------------------------------------------
int __cdecl dbCameraExist(int);
int __cdecl dbGet3DMathsExist(int);
int __cdecl dbSetBlendMappingOn(int,int,int,int);
int __cdecl dbDLLCallExist(int,unsigned long);
void __cdecl dbLoadDLL(unsigned long,int);
float dbObjectSizeX ( int iID, int iUseScaling );
float dbObjectSizeY ( int iID, int iUseScaling );
float dbObjectSizeZ ( int iID, int iUseScaling );
// DWORD dbGetInternalData(void *i); // ???? TODO: see if Dmitry K has posted
// the correct declaraion for this in the TGC forums :(
//----------------------------------------------------------------------------
