plpgsql.so: undefined symbol: PinPortal ?

[Phil <..hidden..>]

Hi all

All of a sudden, I am having problems posting anything to the database:

DBD::Pg::st execute failed: ERROR: could not load library
"/usr/lib/postgresql-8.4/lib/plpgsql.so":
/usr/lib/postgresql-8.4/lib/plpgsql.so: undefined symbol: PinPortal at
LedgerSMB/IS.pm line 877.

Error!

INSERT INTO ar (invnumber, customer_id, employee_id)
VALUES ('Fri Jan 21 13:20:13 20116029', ?, ?)
ERROR: could not load library
"/usr/lib/postgresql-8.4/lib/plpgsql.so":
/usr/lib/postgresql-8.4/lib/plpgsql.so: undefined symbol: PinPortal

Running on Gentoo Linux. No issues previously. I can pull up
statements and previous invoices, just can't post new ones. I've
backed up the database so could theoretically do a re-install but
would rather just fix the problem..

Any ideas?