FTBFS on armfh - implicit-function-declaration

sn_generation.c:66:1: error: implicit declaration of function ‘input_field’ [-Werror=implicit-function-declaration]
   66 | input_field(msg,NULL,0);
      | ^~~~~~~~~~~
sn_generation.c:67:1: error: implicit declaration of function ‘forced_refresh’ [-Werror=implicit-function-declaration]
   67 | forced_refresh();
      | ^~~~~~~~~~~~~~
sn_generation.c: In function ‘sp_fix_IP_packet’:
sn_generation.c:205:22: error: implicit declaration of function ‘in_cksum’ [-Werror=implicit-function-declaration]
  205 | sp_help_ip->checksum=in_cksum((unsigned short *) (sp->buffer),
      | ^~~~~~~~
sn_interface.c: In function ‘mask_status’:
sn_interface.c:195:3: warning: assignment to ‘unsigned char *’ from incompatible pointer type ‘_32_bit *’ {aka ‘unsigned int *’} [-Wincompatible-pointer-types]
  195 | ad=&(mask->source_ip);
      | ^
sn_interface.c:201:3: warning: assignment to ‘unsigned char *’ from incompatible pointer type ‘_32_bit *’ {aka ‘unsigned int *’} [-Wincompatible-pointer-types]
  201 | ad=&(mask->destination_ip);
      | ^
sn_cfgfile.c: In function ‘clean_string’:
sn_cfgfile.c:131:14: error: implicit declaration of function ‘isalnum’ [-Werror=implicit-function-declaration]
  131 | if( (isalnum(string[i]))||(string[i]=='.') )
      | ^~~~~~~
sn_cfgfile.c:17:1: note: include ‘<ctype.h>’ or provide a declaration of ‘isalnum’
   16 | #include "sniffit.h"
  +++ |+#include <ctype.h>
   17 | /* #include "sn_generation.h" */
sn_cfgfile.c: In function ‘clean_filename’:
sn_cfgfile.c:155:15: error: implicit declaration of function ‘iscntrl’ [-Werror=implicit-function-declaration]
  155 | if( !(iscntrl(string[i])) && !(isspace(string[i])) )
      | ^~~~~~~
sn_cfgfile.c:155:15: note: include ‘<ctype.h>’ or provide a declaration of ‘iscntrl’
sn_cfgfile.c:155:40: error: implicit declaration of function ‘isspace’ [-Werror=implicit-function-declaration]
  155 | if( !(iscntrl(string[i])) && !(isspace(string[i])) )
      | ^~~~~~~
sn_cfgfile.c:155:40: note: include ‘<ctype.h>’ or provide a declaration of ‘isspace’
sn_interface.c: In function ‘interaction’:
sn_interface.c:470:25: error: implicit declaration of function ‘isprint’ [-Werror=implicit-function-declaration]
  470 | isprint(*(connection_data+i))?
      | ^~~~~~~

from https://launchpadlibrarian.net/724117947/buildlog_ubuntu-noble-armhf.sniffit_0.5-3build2_BUILDING.txt.gz