plpgsql.so undefined symbol error in pg_upgrade check

Good afternoon.
I am planning a 9.,2 to 9.4 upgrade using pg_upgrade with the link option.
Thanks first to Tom Lane for the prompt answer last week. I have installed
9.4 in the same disk as 9.2 and running pg_upgrade with the --check option
I get this error:

ERROR: could not load library
"/usr/local/pgsql_production/lib/plpgsql.so":
/usr/local/pgsql_production/lib/plpgsql.so: undefined symbol: errcontext

This is pointing to the old 9.2 setup. Of course running with the --check
option I have not shut down 9.2 nor started up 9.4.

Thanks for your time and attention.

--
*Mark Steben*
Database Administrator
@utoRevenue <http://www.autorevenue.com/> | Autobase
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