Dear Gustaf,
thank you very much for the qwick answer. Here is the version numbers:
Version Numbers of XOTcl and Related Packages
Database: PostgreSQL 9.5.3 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413, 64-bit
Server: 4.99.11 (NaviServer)
Tcl: 8.5.19
XOTcl: 2.0.0
Tdom: 0.8.3
libthread: /usr/local/ns/lib/thread2.7.2/libthread2.7.2.so
Tcllib: /usr/local/ns/lib/tcllib1.18
acs-kernel: 2013-09-08, 5.10.0d1
xotcl-core: 2015-02-11, 0.138
xowiki: 2015-05-03, 5.9.0d3
xowf: 2011-05-16, 0.35
Apparently the installation (via repository) went well, but now looking at the error log (I should have done before posting) I found several warnings and one error:
^[[0;32m[29/Jun/2016:09:24:26][1981.7f030fefe700][-conn:oacs-HEAD:1-] ^[[0m^[[1;31mError: Error sourcing /var/lib/ns/oacs-HEAD/packages/xowf/tcl/xowf-form-field-procs.\
tcl:
wrong # args: should be "extend_slot arg" during '::xowiki::formfield::workflow_definition.extend_slot'
::xotcl::Class ::xotcl::Class->create
invoked from within
"::xotcl::Class create workflow_definition -superclass textarea -parameter {
{rows 20}
{cols 80}
{dpi 120}
} -extend_slot validator workf..."
("uplevel" body line 1)
invoked from within
"uplevel [list [self] create {*}$args]"
(procedure "unknown" line 3)
::xotcl::Class ::xotcl::Class->unknown
invoked from within
"Class workflow_definition -superclass textarea -parameter {
{rows 20}
{cols 80}
{dpi 120}
} -extend_slot validator workflow"
(in namespace eval "::xowiki::formfield" script line 8)
invoked from within
"namespace eval ::xowiki::formfield {
###########################################################
#
# ::xowiki::formfield::workflow_definition
..."
(file "/var/lib/ns/oacs-HEAD/packages/xowf/tcl/xowf-form-field-procs.tcl" line 10)
I'm just experimenting and so I could could simply restart with OpenACS 5.9.