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library(tcltk)
is built on top of Tcl/Tk. It is an optional
component of SICStus and you can safely ignore this section if you do
not intend to use library(tcltk)
.
Tcl/Tk itself is not included in the SICStus distribution. It must be installed in order to use the interface. Many operating systems have build-in support for Tcl/Tk, either preinstalled or available via some software update utility. If a default version is not available, then Tcl/Tk can be downloaded from the Tcl/Tk primary website:
A better alternative may be to use one of the free installers available from:
SICStus for Mac OS X uses the Tcl/Tk that comes with Mac OS X. Some
versions of Tcl/Tk provided by Apple have bugs that may cause SICStus
Prolog to crash when using library(tcltk)
. If this happens,
then you can try to update to a newer version of Tcl/Tk, e.g. by
using the installers from https://www.activestate.com/. Tcl/Tk
is also easy to build from source.
Starting with release 4.7, library(tcltk)
is built in a way
that does not depend on the version of Tcl/Tk that will be available
at runtime. As an example, even though library(tcltk)
on macOS
is built with the Apple default version of Tcl/TK (8.5), it will
automatically start using a newer version, e.g Tcl/Tk 8.6, if the new
version is installed in one of the default locations.
Please note: On Windows, you need to have the Tcl/Tk binaries accessible from your
PATH
environment variable, e.g. C:\Program Files\Tcl\bin.
The GUI version of SICStus, spwin
, like all Windows non-console
applications, lacks the C standard streams
(stdin
, stdout
, stderr
) and the Tcl command
puts
and others that use these streams will therefore give
errors. The solution is to use sicstus
instead of
spwin
if the standard streams are required.
• The Tcl/Tk Terminal | The Tcl/Tk Terminal Window |