Well, actually, I would try just running the binaries, first; it may well be 
that 10.11 doesn’t require the manual deletion of the quarantine flags.

You can also try using a right-click and choosing “open” from the menu; this 
clears the quarantine flag in many cases.

If it does turn out to be necessary, the command is

xattr -d com.apple.quarantine <name-of-binary>

… IIRC.  You’ll probably need to run this on (at least) two targets: the 
DrRacket.app directory, and the racket binary in the bin/ directory.

John

> On Nov 27, 2019, at 11:30, Bruce O'Neel <bruce.on...@pckswarms.ch> wrote:
> 
> 
> 
> Hi,
> 
> What would be the magic xattr command?
> 
> Thanks.
> 
> bruce
> 
> 27 November 2019 20:26 "'John Clements' via Racket Users" 
> <racket-users@googlegroups.com> wrote:
> This is 100% workaround rather than a fix, but have you considered using the 
> minimal racket tarball:
> 
> https://download.racket-lang.org/releases/7.5/installers/racket-minimal-7.5-x86_64-macosx.tgz
> 
> …and then manually blessing the binaries using xattr and then installing the 
> rest of the system manually using raco pkg install?
> 
> John
> 
> 
> 
> > On Nov 27, 2019, at 09:42, Darth Vadør wrote:
> >
> > I am having the same problem, and I am pretty sure that this is because the 
> > new DMG uses the novel APFS format, which is not readable by our old HFS 
> > computers.
> > As far as I know, HFS DMGs can be opened on new APFS Macs; would it be 
> > possible / a good idea to keep distributing Racket on an HFS DMG for our 
> > dinosaur machines?
> >
> > Long live 10-year-old Macs,
> > Louis
> >
> > On Monday, November 25, 2019 at 8:22:36 PM UTC+1, David Storrs wrote:
> > When I download and install the .dmg file from racket-lang, I'm told "no 
> > mountable filesystems". I'm not sure if this is an issue with how it was 
> > built, with my machine, or with OSX in general.
> >
> > This may not be worth worrying about, since OSX 10.11 was released
> > September 30, 2015 and Apple has decided that something from four years ago 
> > is FAR too old to worry about backwards compatibility. (grumble, grumble)
> >
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