ofSystem bug with fclose in openframeworks

gistfile1.cpp

string ofSystem(string command){
	FILE * ret = NULL;
#ifdef TARGET_WIN32
        ret = _popen(command.c_str(),"r");
#else
        ret = popen(command.c_str(),"r");
#endif
        
        string strret;
        char c;
        
        if (ret == NULL){
            ofLogError("ofUtils") << "ofSystem(): error opening return file for command \"" << command  << "\"";
        }else{
            
            // this method includes the EOF character?
            /*do {
                c = fgetc (ret);
                strret += c;
            } while (c != EOF);*/
            
            while((c = fgetc(ret)) != EOF) {
                strret += c;
            }
            
            //fclose (ret); // WRONG - BUG!
		#ifdef TARGET_WIN32
		_pclose (ret);
		#else
		pclose (ret);
		#endif
            
        }
        
        return strret;
}