"Alexis Wilke" <alexis@m2osw.com> writes:
> Operating system: Linux
You need to be a lot more specific than that, because this stuff works
fine on all the variants of Linux we know about.
> ERROR: Load of file /usr/local/pgsql/lib/ltree.so failed:
> /usr/local/pgsql/lib/ltree.so: undefined symbol: errstart
Are you sure you're loading into a 7.4-or-later backend? (Check "select
version();" to be certain.) The only other possibility I can think of
is that the backend has been stripped of symbols --- in which case it's
not errstart that's at fault particularly, that just happens to be the
first missing symbol reported.
regards, tom lane