I'm not sure why anyone bothers.
My old Atom based netbook that is from around 2009 works fine with all current KL distros and probably therefore newest Puppy distros too (new distro build is best way actually to update glibc). Okay, a few may somehow like using even older machines, but surely that is a handful of people only (and most of these may be on this forum...)? So much newer more-energy-efficient/less-power-hungry machines being thrown out for nothing to landfill than the old now junk laptops I used to have (long dead Pentium M and worse rubbish - not just landfill now, also really is rubbish by even ten-year-ago standards).
I don't myself therefore see the point of spending so much time over such dodgy upgrades at all - so much useful work could be done, by those capable, instead. However, if it is something you love experimenting with, fair enough, but certainly not important even short-term...
Thing is, if the old machine needs a 'portable app' that relies on modern libs then any slow-down resulting from these modern libs, gtk, qt, whatever..., is going to apply in that scenario too - might as well just use a more modern distro then... and modern browser certainly requires many a modern lib amongst its dependencies. Whole thing doesn't make sense to me, but I simply don't have much time to spare as it is anyway, so I focus on what seems relevant to me now and in the future. But fine, of course anyone can delete an old glibc and stick a newer one in its place (be that in an aufs or overlayfs layer or however), so if that keeps someone happy, why not?
I'm not the type that bothers running ZX Spectrum emulators either - even though I used to solder them together once upon a time in kit form (older ones than that model too). Then again I use up tons of my own time sitting in cafes on a daily basis... and sometimes, to be honest, were it not for family business needs, and occasional coding for FirstRib, I hardly use computers for anything - just web browsing that I could indeed just do on my android phone. I do have tons of old computers in the garden shed now - some still work... but I think I'd have more fun crushing them with a sledgehammer to more easily throw in the rubbish bag (well - except for the toxins they no doubt contain). Hate to be negative about the point of updating glibc on now out-of-date insecure old distros, but I do 'wonder' if such repeated thread topics don't discourage active new membership here. How exactly do you define or cause death and/or invoke new life?
bigpup wrote: Fri Aug 11, 2023 4:51 am
What may need changed to get it to work in Puppy?
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After glibc actually gets updated.
Then we can talk about fixing any issues this may cause.
Or if it causes too many issues.
We can say do not try this. 
ozsouth wrote: Fri Aug 11, 2023 12:11 am
@mikewalsh - most folk seem to absolutely love the older, smaller stuff. I didn't try to update glibc in fossa64 series (I consider it too risky), but updated security stuff, & the result was very popular - about 100 downloads, even though base 3 years old & opengl missing.
...
'base' three years old isn't so very old though, not like some of the living-dead-distros some are enthusiasting about constantly.
In terms of how things used to be, what has changed that effects topics like upgrades to glibc? Well, here is a quote I found on Distrowatch:
...there are typically 6 - 8 weeks between Puppy releases.
If people are busy revamping very old distros I suspect there are fewer people left available to focus their efforts on improving, creating or contributing to new releases. If we decide there is no real point in upgrading to newer releases, then why are we here? Possible answer might indeed be that main interest here nowadays is in the past - that's different than it used to be though. Well, maybe on the whole the audience remains the same (albeit less in size)? That would explain a lot, and if so, the forum should make that clear so people know what is wanted most here. Once upon a time you wanted new releases though (yes, it was also about tiny size back then when resources of computers had tiny size).