More specific build and install instructions for older devices and IOS versions

[brnrds]

I've been trying to figure out how to build minivmac4ios for an iPad 2 running iOS 9.x. To that end, I set up an old 2009 iMac with El Capitan and the last version of Xcode said OS version supports. Multiple build errors ensue, which I think may be related with actually getting all of the files from GitHub correctly, at the specific release commit just before iOS 9 support was dropped.

Conversely, this should (in theory?) be possible using a recent-ish supported Intel Mac OS and it's corresponding version of Xcode but I've also had no luck in that department.

It's not that the current instructions are terribly incomplete, just somewhat generic and seem to make assumptions of what the build environments are, when so many variables are at play.

My end-goal, to emphasise, is the get minivmac4ios running on an iPad 2. It should, by way of shear computing capability, run on an iPad 1, but that seems to be out of the question. Would running on an iPad 2, with iOS 9.x be viable? If so, how?

[zydeco]

It should be possible to build an older version from an old commit, with a contemporary version of Xcode (or any version that supports the version of iOS you're building for).
003c075 and older support iOS 9, unless I accidentally introduced some newer API usage at some earlier point.

Errors about missing source code files are likely due to submodules not being checked out.
When switching commits, use git submodule update --init --recursive to ensure the submodules match the current commit.