IOS required SDK

J. Landman Gay jacque at
Sat Apr 24 14:30:35 EDT 2021

Thanks to both you and Scott. I'm still unsure how to proceed. There is 
really only one 32-bit app I need to maintain and I have an ancient MacBook 
Air that is stuck at Mac OS High Sierra. I could move the app there and 
update my main working Mac to Big Sur. My main concern is that the Air will 
fail and I'll lose all the accumulated data.

Maybe I'll keep good backups and pray. If it does bite the dust I'll move 
to a VM with Mojave on it. In my case I don't use the app often enough to 
make that an inconvenience.

Jacqueline Landman Gay | jacque at
HyperActive Software |
On April 23, 2021 6:33:43 PM Paul Dupuis via use-livecode 
<use-livecode at> wrote:

> No need to partition drives with VMs. You *do* need a good chunk of free
> disk space, for example for Catalina, you probably want a minimum of a
> 50GB "drive" (a VM file on disk) and for Big Sur, I went to 100GB, but I
> have a 1TB hard disk.
> We also have a MacMini here with a bunch of external USB disk drives and
> a ton of partitions each with a different macOS from 10.9 up to 10.15,
> but rebooting to a different macOS version for testing is a pain in the
> butt compared to VMs.
> All you really need is (1) VirtualBox for macOS and (2) installation
> file(s) for the macOS's you want to install. For current and most recent
> OS, these can usually be downloaded from the Apple Developer site. For
> anything older, you have to do some hunting as Apple does not have an
> archive of older version of macOS for developers (that I can find!) It
> is easiest if the installer for macOS is an .iso disk image. Then you
> run VirtualBox, create a new VM, set it for macOS, create a disk of the
> suitable size. Mount the .iso image file as a "virtual" disc drive and
> start it up and follow the macOS install instructions. (there is devils
> in the details, but that really is the jist)
> On 4/23/2021 5:43 PM, J. Landman Gay via use-livecode wrote:
>> Thanks Paul, I was wondering about a VM. I've scanned Oracle's docs
>> for all of 10 minutes but it looks a bit complicated. Did you need to
>> partition your hard drive? It also says to put the OS intaller on a
>> DVD but of course we don't have DVD drives any more. Does the mounted
>> OS install image work?
>> On 4/23/21 4:13 PM, Paul Dupuis via use-livecode wrote:
>>> On 4/23/2021 5:02 PM, J. Landman Gay via use-livecode wrote:
>>>> Apple will require SDK 14 for new or updated iOS apps. Due to
>>>> incompatible 32-bit software, I'm still on Mojave. Does this mean I
>>>> need to update to Big Sur or Catalina before I can build for iOS?
>>>> I don't suppose there's any way to do it on Mojave? I've been
>>>> dreading this...
>>> I run Mojave on a Macbook Pro and use VirtualBox to have a Catalina
>>> and Big Sur VMs as I too have 32 bit software I want to be able to
>>> continue to run. I do macOS development under Mojave and only use the
>>> Catalina and/or Big Sur VMs for testing or builds (if for some reason
>>> I need to check a build under one of those OSes. Both Catalina and
>>> Big Sur work with VirtualBox. VMs are of course slower, but he
>>> ability to back them up, clone them, restore to a specific save point
>>> and such I think outweigh  the speed as a developer tool.
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