Raco unable to install packages on macOS due to SSL/TLS certificate issues

My issue on macos v10.11.6 is the same as one I have found here:
Raco unable to install packages on macOS due to SSL/TLS certificate issues #4108
rmculpepper added 3 commits 2 years ago
/github.com/racket/racket/pull/4117
openssl: use SecTrustCopyAnchorCertificates by default on Mac OS
Related to racket#4108

Two solutions were proposed in response to the problem but they don't quite work for me yet because:
a) In the case of adding 3 lines to file: mzssl.rkt, file: login.keychain-db does not exist on my system. Is that something I can create?
b) In the case of Ryan Culpepper's idea to: use SecTrustCopyAnchorCertificates by default, I don't know how to specify that.
Thanks for any help you can give.
Don Green

As I wrote in the other thread: