Bug#1069309: xfractint FTBFS: error: implicit declaration of function

[Adrian Bunk <bunk@debian.org>]

Source: xfractint
Version: 20.4.10-4
Severity: serious
Tags: ftbfs
X-Debbugs-Cc: Petter Reinholdtsen <pere@debian.org>

https://buildd.debian.org/status/logs.php?pkg=xfractint&ver=20.4.10-4

...
/usr/bin/gcc -I../headers -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -I./headers -DXFRACT  -DNOBSTRING   -g -DBIG_ANSI_C -DLINUX -fno-builtin -fcommon -O2 -Wdate-time -D_FORTIFY_SOURCE=2  -c -o 3d.o 3d.c
3d.c: In function ‘longvmultpersp’:
3d.c:290:20: error: implicit declaration of function ‘multiply’ [-Werror=implicit-function-declaration]
  290 |          tmp[j] += multiply(s[i],m[i][j],bitshift);
      |                    ^~~~~~~~
3d.c:318:20: error: implicit declaration of function ‘divide’ [-Werror=implicit-function-declaration]
  318 |       tmpview[0] = divide(lview[0],denom,bitshift);
      |                    ^~~~~~
cc1: some warnings being treated as errors
make[3]: *** [<builtin>: 3d.o] Error 1