[Reduce-algebra-developers] expansion of gamma function

[<gr...@ge...>]

grozin@dns ~/reduce-3235 $ bin/rfpsl
Redfront 3.2, built 09-Oct-2015 ...
Loading image file: 
/home/grozin/reduce-3235/pslbuild/x86_64-unknown-gentoo2.2/red/reduce.img

Reduce (Free PSL version),  9-Oct-2015 ...

1: load_package specfn;

2: load_package tps;

3: psexplim 5$

4: ps(gamma(1+x),x,0);
***** `polygamma_aux' is an undefined function

5:

What can polygamma_aux be?
I seem to remember that in elder days this expansion worked (though maybe 
I'm wrong).

Andrey