Tue, 18 May 2021 22:02:21 +0200 wenzelm option document_preprocessor;
Tue, 18 May 2021 21:09:51 +0200 wenzelm show symbols in Isabelle/ML instead of perl;
Tue, 18 May 2021 20:19:02 +0200 wenzelm more robust run of makeindex (amending 0f0a2148a099, Gerwin Klein 2004), using the old status-quo of e.g. doc-src/Intro/Makefile;
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