FTBFS on armfh - implicit-function-declaration

[Miriam España Acebal]

vncconnect.c:17:5: error: implicit declaration of function ‘exit’ [-Werror=implicit-function-declaration]
   17 | exit(1);
      | ^~~~
vncconnect.c:8:1: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
    7 | #include <X11/Xatom.h>
  +++ |+#include <stdlib.h>
    8 |
vncconnect.c:17:5: warning: incompatible implicit declaration of built-in function ‘exit’ [-Wbuiltin-declaration-mismatch]
   17 | exit(1);
      | ^~~~
vncconnect.c:17:5: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
vncconnect.c: In function ‘main’:
vncconnect.c:51:9: warning: incompatible implicit declaration of built-in function ‘exit’ [-Wbuiltin-declaration-mismatch]
   51 | exit(1);
      | ^~~~
vncconnect.c:51:9: note: include ‘<stdlib.h>’ or provide a declaration of ‘exit’
vncconnect.c:58:21: error: implicit declaration of function ‘strlen’ [-Werror=implicit-function-declaration]
   58 | strlen(argv[i]));
      | ^~~~~~
vncconnect.c:8:1: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
    7 | #include <X11/Xatom.h>
  +++ |+#include <string.h>
    8 |
vncconnect.c:58:21: warning: incompatible implicit declaration of built-in function ‘strlen’ [-Wbuiltin-declaration-mismatch]
   58 | strlen(argv[i]));
      | ^~~~~~
vncconnect.c:58:21: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
cc1: some warnings being treated as errors

[...]

vncauth.c:60:13: error: implicit declaration of function ‘vncEncryptAndStorePasswd2’; did you mean ‘vncEncryptAndStorePasswd’? [-Werror=implicit-function-declaration]
   60 | return (vncEncryptAndStorePasswd2(passwd, NULL, fname) == 0);
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
      | vncEncryptAndStorePasswd
vncauth.c: In function ‘vncDecryptPasswdFromFile’:
vncauth.c:131:13: error: implicit declaration of function ‘vncDecryptPasswdFromFile2’; did you mean ‘vncDecryptPasswdFromFile’? [-Werror=implicit-function-declaration]
  131 | if (vncDecryptPasswdFromFile2(fname, passwd, NULL) == 0) {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
      | vncDecryptPasswdFromFile
vncauth.c: In function ‘vncRandomBytes’:
vncauth.c:211:28: error: implicit declaration of function ‘time’ [-Werror=implicit-function-declaration]
  211 | seed = (unsigned int)time(0) ^ (unsigned int)getpid();
      | ^~~~

from https://launchpadlibrarian.net/724118029/buildlog_ubuntu-noble-armhf.tightvnc_1%3A1.3.10-7build2_BUILDING.txt.gz