hfsutils: FTBFS: hpwd.c:55:7: error: implicit declaration of function ‘strcmp’ [-Werror=implicit-function-declaration]

Imported from Debian bug http://bugs.debian.org/1066216:

Source: hfsutils
Version: 3.2.6-15
Severity: serious
Justification: FTBFS
Tags: trixie sid ftbfs
User: <email address hidden>
Usertags: ftbfs-20240313 ftbfs-trixie ftbfs-impfuncdef

Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.

This is most likely caused by a change in dpkg 1.22.6, that enabled
-Werror=implicit-function-declaration. For more information, see
https://wiki.debian.org/qa.debian.org/FTBFS#A2024-03-13_-Werror.3Dimplicit-function-declaration

Relevant part (hopefully):
> gcc -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Ilibhfs -I/usr/include/tcl -I/usr/include/tk -DHAVE_CONFIG_H -DUSE_INTERP_RESULT -c -o hpwd.o hpwd.c
> hpwd.c: In function ‘hpwd_main’:
> hpwd.c:55:7: error: implicit declaration of function ‘strcmp’ [-Werror=implicit-function-declaration]
> 55 | if (strcmp(ent->cwd, ":") == 0)
> | ^~~~~~
> hpwd.c:32:1: note: include ‘<string.h>’ or provide a declaration of ‘strcmp’
> 31 | # include "hpwd.h"
> +++ |+#include <string.h>
> 32 |
> cc1: some warnings being treated as errors
> make[1]: *** [<builtin>: hpwd.o] Error 1

The full build log is available from:
http://qa-logs.debian.net/2024/03/13/hfsutils_3.2.6-15_unstable.log

All bugs filed during this archive rebuild are listed at:
https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=ftbfs-20240313;<email address hidden>
or:
https://udd.debian.org/bugs/?release=na&merged=ign&fnewerval=7&flastmodval=7&fusertag=only&fusertagtag=ftbfs-20240313&<email address hidden>&allbugs=1&cseverity=1&ctags=1&caffected=1#results

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

If you reassign this bug to another package, please mark it as 'affects'-ing
this package. See https://www.debian.org/Bugs/server-control#affects

If you fail to reproduce this, please provide a build log and diff it with mine
so that we can identify if something relevant changed in the meantime.