I got the tar_files from current a few days ago.
In src/usr.bin/vi I get:

===> build
/usr/libexec/ld.so: warning: libc.so.12.3: minor version >= 16 expected, using it anyway
cc -O -I/Net/usr/src/usr.bin/vi/build -I/Net/usr/src/usr.bin/vi/build/../include  -Werror  -c /usr/src/usr.bin/vi/build/../common/options.c
/usr/src/usr.bin/vi/build/../common/options.c: In function `opts_init':
/usr/src/usr.bin/vi/build/../common/options.c:342: `_PATH_MSGCAT' undeclared (first use this function)
/usr/src/usr.bin/vi/build/../common/options.c:342: (Each undeclared identifier is reported only once
/usr/src/usr.bin/vi/build/../common/options.c:342: for each function it appears in.)
*** Error code 1

Can anybody tell me where _PATH_MSGCAT is supposed to be set to and
what it is supposed to be set to?

TIA,
Paul