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[subsection Critcl]
The [syscmd critcl] tool is an [emph optional] dependency.
[para] It is only required when trying to build the C-based
[term accelerators] for a number of packages, as explained in
[sectref {Critcl & Accelerators}]
[para] Tcllib's build system looks for it in the [variable PATH],
using the name [syscmd critcl]. This is for Unix.
On Windows on the other hand the search is more complex. First we look
for a proper application [syscmd critcl.exe]. When that is not found
we look for a combination of interpreter ([syscmd tclkitsh.exe],
[syscmd tclsh.exe]) and starkit ([syscmd critcl.kit], [syscmd critcl])
instead. [emph Note] that the choice of starkit can be overriden via
the environment variable [variable CRITCL].
[para] Tcllib requires Critcl version 2 or higher.
[para] The github repository providing releases of version 2 and
higher, and the associated sources, can be found at
[uri http://andreas-kupries.github.com/critcl].
[para] Any branch of the repository can be used (if not using the
prebuild starkit or starpack), although the use of the stable branch
[emph master] is recommended.
[para] At the above url is also an explanation on how to build and
install Critcl, including a list of its dependencies.
[para] Its instructions will not be repeated here. If there are
problems with these directions please file a ticket against the
[term Critcl] project, and not Tcllib.
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