iftop.c:148:61: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
           if (!options.timed_output || options.timed_output && t - first_timestamp >= options.timed_output) {
                                                             ^
iftop.c: In function 'handle_llc_packet':
iftop.c:503:9: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
         et = EXTRACT_16BITS(&llc->llc_ethertype[0]);
         ^
iftop.c: In function 'packet_init':
iftop.c:690:5: warning: implicit declaration of function 'get_addrs_ioctl' [-Wimplicit-function-declaration]
     result = get_addrs_ioctl(options.interface, if_hw_addr,
     ^
iftop.c:682:9: warning: unused variable 's' [-Wunused-variable]
     int s;
         ^
iftop.c: In function 'main':
iftop.c:801:5: warning: implicit declaration of function 'options_read_args' [-Wimplicit-function-declaration]
     options_read_args(argc, argv);
     ^
iftop.c:804:5: warning: implicit declaration of function 'options_make' [-Wimplicit-function-declaration]
     options_make();


options.c:303:17: warning: implicit declaration of function 'config_set_string' [-Wimplicit-function-declaration]
                 config_set_string("dns-resolution","false");
                 ^
options.c: In function 'options_config_get_enum':
options.c:425:9: warning: implicit declaration of function 'config_get_enum' [-Wimplicit-function-declaration]
         if(config_get_enum(name, enumeration, &i)) {
         ^
options.c: At top level:
options.c:181:13: warning: 'set_max_bandwidth' defined but not used [-Wunused-function]:q!
 static void set_max_bandwidth(char* arg) {
             ^
options.c:207:13: warning: 'set_net_filter' defined but not used [-Wunused-function]
 static void set_net_filter(char* arg) {

ui_common.c:167:9: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration]
         free(nn->data);
         ^
ui_common.c:167:9: warning: incompatible implicit declaration of built-in function 'free' [enabled by default]
ui_common.c: In function 'analyse_data':
ui_common.c:265:13: warning: variable 'tsent' set but not used [-Wunused-but-set-variable]
         int tsent, trecv;

ui.c: In function 'draw_line_total':
ui.c:197:22: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
         readable_size(n, buf, 10, 1024, bytes);
                      ^

tui.c: In function 'tui_loop':
tui.c:301:3: warning: label 'endloop' defined but not used [-Wunused-label]
   endloop:
   ^
tui.c:179:9: warning: ignoring return value of 'system', declared with attribute warn_unused_result [-Wunused-result]
   system("/bin/stty cbreak -echo >/dev/null 2>&1");
         ^
tui.c:302:9: warning: ignoring return value of 'system', declared with attribute warn_unused_result [-Wunused-result]
   system("/bin/stty -cbreak echo >/dev/null 2>&1");

cfgfile.c:161:5: warning: implicit declaration of function 'strtol' [-Wimplicit-function-declaration]
     *value = strtol(s, &t, 10);
     ^
cfgfile.c: In function 'config_get_float':
cfgfile.c:183:5: warning: implicit declaration of function 'strtod' [-Wimplicit-function-declaration]
     *value = strtod(s, &t);
     ^
cfgfile.c:172:11: warning: unused variable 'I' [-Wunused-variable]
     item *I;
           ^
cfgfile.c: In function 'read_config':
cfgfile.c:248:11: warning: unused variable 'o' [-Wunused-variable]
     void* o;