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I hope this is the right place to post.
The festival package (in [extra]) has been an orphan and out-of-date for a while, 2.1 is packaged, 2.4 is available. I fixed some of the errors coming up when trying to build festival 2.4 in the festival-patched-hts package (AUR) , and it works quite well now. The PKGBUILD can be modified for the non-HTS-patched version quite easily, only removing the relevant patches, and I kept modifications to a necessary minimum (to make it obvious I don't have any bad intentions...). Because of this, I wonder if some package maintainer could pick the actual festival package up and apply my changes to make it work with 2.4.
I encountered a build error that is very likely an upstream bug , but I don't have time to report it right now. A workaround until the issue is resolved upstream is included. Aside from that, I changed the MD5 hashes to SHA-256 hashes and removed some parts of the some of the compatibility patches that were made obselete by upstream changes.
Please do not hestitate to ask me further questions regarding the changes involved.
Thank you very much in advance, Best regards Tobias
 https://aur4.archlinux.org/packages/festival-patched-hts/  festival/src/modules/clustergen/HTS_vocoder_me.cc includes a C file (not a header!), namely festival/src/modules/hts_engine/HTS_vocoder.c, causing linkage errors (multiple definitions of symbol). Workaround is a header file and some uncontroversial non-breaking changes.