Marios Vodas <mvo...@gmail.com> writes:
> I want to create this function:
> CREATE OR REPLACE FUNCTION myfunction(cstring)
> RETURNS cstring AS
>     '$libdir/mylib','myfunction'
> LANGUAGE 'C' IMMUTABLE STRICT;

> In windows this is working fine and $libdir is substituted by the actual
> path. In linux it is not substituted!

I rather doubt that, considering that it works fine for everybody else.

> This is the error I get:
> ERROR:  could not access file "$libdir/mylib": No such file or directory

So is mylib.so actually there in the library directory?  (Try
"pg_config --pkglibdir" to confirm which directory that is.)
If so, try ldd on it --- maybe the problem is with some library
it references, not mylib.so itself.

                        regards, tom lane

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