I'm getting the above error in Visual Studio 2019. I'm posting a link to two screen shots so you can see what I'm talking about. I'm happy to post code as soon as I find out what you guys need.
You need spaces between the string literals and the macros in the macro definition
1 2
//Note the spaces
#define NTALK_LOGFILE "logs" DIR_SYM "channels" DIR_SYM "ntalk.txt"
The same for DELETE_DIR.
By the way, I assume DIR_SYM expands to "/" or "\\" depending on whether the OS is Windows or UNIX. Windows understands forwards slashes in paths at the API level, so you don't need to do that. This: