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This patch is from @kitterma, i'm just forwarding it from https://trac.ietf.org/trac/xml2rfc/ticket/696 (it's also at https://bugs.debian.org/1001824)
Weasyprint 53 and later no longer use cairo and pango, so xml2rfc tests for PDF generation capability need updating. Also, it appears that test_text_ content is obsolete with the new Weasyprint. The test fails even though PDF generation succeeds.
On debian and debian-derived systems, the suggestions that remain in run.py when weasyprint isn't available are rather over-complicated,but debian can continue to patch in more streamlined suggestions for its distribution.