Public bug reported:

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

** Affects: tightvnc (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: tightvnc (Debian)
     Importance: Unknown
         Status: Unknown

** Bug watch added: Debian Bug tracker #1066337
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1066337

** Also affects: tightvnc (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1066337
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/2061028

Title:
  FTBFS on armfh - implicit-function-declaration

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