5.8.4 or higher is recommended. TWiki will run in perl 5.6.1 but only with Wysiwyg editor disabled. Wysiwyg requires unicode support which is provided by perl 5.8.1 and forward.
RCS
5.7 or higher (including GNU diff) Optional, TWiki includes a pure perl implementation of RCS that can be used instead (although it's slower)
GNU diff
GNU diff 2.7 or higher is required when not using the all-Perl RcsLite? . Install on PATH if not included with RCS (check version with diff -v) Must be the version used by RCS, to avoid problems with binary attachments - RCS may have hard-coded path to diff
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