[Bug 293330] lang/gforth: Fails to build with GCC 15 error: conflicting types for 'getopt'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293330

            Bug ID: 293330
           Summary: lang/gforth: Fails to build with GCC 15 error:
                    conflicting types for 'getopt'
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://pkg-status.freebsd.org/gohan05/data/143amd64-d
                    efault-foo/2026-01-30_10h01m25s/logs/errors/gforth-0.7
                    .3_15.log
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: danfe@FreeBSD.org
          Reporter: salvadore@freebsd.org
            Blocks: 292692
          Assignee: danfe@FreeBSD.org
             Flags: maintainer-feedback?(danfe@FreeBSD.org)

The port fails to build with GCC 15 and blocks GCC_DEFAULT update to 15. Full
log in URL field. This link might be useful:
https://gcc.gnu.org/gcc-15/porting_to.html .

In file included from ./main.c:47:
./getopt.h:104:12: error: conflicting types for 'getopt'; have 'int(void)'
  104 | extern int getopt ();
      |            ^~~~~~
In file included from ./forth.h:25:
/usr/include/unistd.h:378:10: note: previous declaration of 'getopt' with type
'int(int,  char * const*, const char *)'
  378 | int      getopt(int, char * const [], const char *);
      |          ^~~~~~


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292692
[Bug 292692] [exp-run] Update GCC_DEFAULT to 15
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