(I sent this message yesterday, but the server rejected it because my provider's mail server is classified as UCEProtect level1. Now I'm sending this from gmail account...)
I found that flex port tries to build flex.pdf, requiring TeX but no dependency. I believe the PDF document is not necessary because it already contains info document (flex.info, flex.info-1, flex.info-2). Here is a patch to remove pdf creation. -- yozo.
patch-devel-flex
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