Armv7 buildworld puzzle

An attempt to build world on armv7 (PI2 v1.1) keeps getting stuck with:
jaillex.c:850:1: error: declaration shadows a variable in the global scope [-Werror,-Wshadow]

Repeat git pulls find no updates related to jailex.c and find does not discover
any file in /usr/src by that name.

Git status reports 

On branch stable/14
Your branch is up to date with 'freebsd/stable/14'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        buildscript
        buildworld.log
        installscript

I'm mystified, first at the build stoppage and second by the file being
named and quoted but not find-able.

The system isn't valuable, but if there's an easy fix or workaround
I'd like to try it. The system started life as 12.4. Sources were
replaced with stable/14, a new kernel was built and runs seemingly
ok. To have buildworld fail past the "building everything" mark with
a complaint quoting a file that's not visible is quite baffling. 

Thanks for reading,

bob prohaska