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PS The above code is also broken.
The strcat() command assumes there is enough space in the destination. This is not true. Additionally the result of getenv() is not modifiable (even if does return char* (C is not know for its const correctness)). So copy data onto the end of the string is not allowed

#if defined linux || defined __linux__ || defined __linux  // Linux  
#define PLATFORM_CONFIG_PATH    strcat(getenv("HOME"),"/.dict_config.txt")
#define PLATFORM_RESET_COMMAND  "reset"

#elif defined __WIN32 || defined __WIN64  // Windows  
#define PLATFORM_CONFIG_PATH    config_path=strcat(getenv("USERPROFILE"),"\\My Documents\\dict_config.txt")
#define PLATFORM_RESET_COMMAND  "cls"

#else
#error "Untested platform"
#endif  


/*
 * Path to store configuration File
 * which will contain location of dictionary and its backup on Linux...
 */
const char* config_path  = PLATFORM_CONFIG_PATH;  
const char* clear_screen = PLATFORM_RESET_COMMAND;  

#if defined linux || defined __linux__ || defined __linux  // Linux  
#define PLATFORM_CONFIG_PATH    strcat(getenv("HOME"),"/.dict_config.txt")
#define PLATFORM_RESET_COMMAND  "reset"

#elif defined __WIN32 || defined __WIN64  // Windows  
#define PLATFORM_CONFIG_PATH    strcat(getenv("USERPROFILE"),"\\My Documents\\dict_config.txt")
#define PLATFORM_RESET_COMMAND  "cls"

#else
#error "Untested platform"
#endif  


/*
 * Path to store configuration File
 * which will contain location of dictionary and its backup on Linux...
 */
const char* config_path  = PLATFORM_CONFIG_PATH;  
const char* clear_screen = PLATFORM_RESET_COMMAND;  

The main problem with this code is that it is not C++.

It is basically a set of functions (ie. Just C code that happens to use some C++ structures and objects in passing). There is nothing inherently C++ about this code.