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add --with-wordbounds to configure to fix bad regexes: https://lists.gnu.org/archive/html/help-nano/2013-01/msg00001.html See https://savannah.gnu.org/bugs/?50705 TL;DR: seems like a bug in configure which ends up wrongly assuming it needs to use an alternative word-boundary regex syntax [[:<:]] - which the resulting binary doesn't actually support, and so it spawns a lot of errors while trying to load and parse color syntax files. As a workaround until it's resolved upstream, adding --with-wordbounds forces it to use a regex syntax which the binary does support, and color syntax files are now loaded and used correctly and without errors.
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