[exim] compiling 4.91 under FreeBSD

Had someone this error? Using port:

cc tls.c
In file included from tls.c:122:
tls-openssl.c: In function `tls_refill':
tls-openssl.c:2499: error: structure has no member named `verify_stack'
tls-openssl.c:2502: error: structure has no member named `verify_stack'
tls-openssl.c: In function `tls_close':
tls-openssl.c:2778: error: structure has no member named `verify_stack'
tls-openssl.c:2779: error: structure has no member named `verify_stack'
*** Error code 1
Stop in /usr/ports/mail/exim/work/exim-4.91/build-FreeBSD-i386.

# /usr/local/bin/openssl version
OpenSSL 1.0.2o 27 Mar 2018