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--- sv.c        2020-09-29 22:29:16.781395700 +1000
+++ sv.c_mod    2020-10-02 11:35:20.728840400 +1000
...
                 );
                 elen = strlen(ebuf);
                 eptr = ebuf;

cc -c -DPERL_CORE -fwrapv -fno-strict-aliasing -pipe -fstack-protector
+-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=
+64 -std=c89 -O2 -Wall -Werror=pointer-arith -Wextra -Wc++-compat -Wwr
+ite-strings -Werror=declaration-after-statement sv.c

#include <stdio.h>

...
 return 0;
}

In file included from sv.c:32:0:
sv.c: In function ‘Perl_sv_vcatpvfn_flags’:
...
   return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       __bos (__s), __fmt, __va_arg_pack ());