[pgsql-pkg-debian] weird warnings with 9.6 install

On xenial using PGDG:

Removing obsolete dictionary files:
Setting up postgresql-9.6 (9.6.1-2.pgdg16.04+1) ...
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.
Unescaped left brace in regex is deprecated, passed through in regex;
marked by <-- HERE in m/(?<!\\)\${ <-- HERE ([^}]+)}/ at
/usr/sbin/pam_getenv line 78.

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