misc/60271: Building netbsd-11 branch fails on linux host

["Andreas Gustafsson via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60271
>Category:       misc
>Synopsis:       Building netbsd-11 branch fails on linux host
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat May 16 14:15:00 +0000 2026
>Originator:     Andreas Gustafsson
>Release:        NetBSD-11 branch, source date 2026.05.15.09.30.11
>Organization:
  
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

Building the NetBSD-11 branch on a Debian 13 system fails with:

  /dev/shm/build/2026.05.15.09.30.11-amd64-11-baremetal/xsrc/external/mit/fontconfig/dist/fc-cache/fc-cache.c:336:17: error: implicit declaration of function 'getopt' [-Wimplicit-function-declaration]

Logs:

  https://www.gson.org/netbsd/bugs/build/amd64-11-baremetal/commits-2026.05.html#2026.05.15.09.30.11

>How-To-Repeat:

>Fix: