For those who already installed Dialog as described above, I can confirm that upgrading to the latest version of Dialog Dialog version 0j/04 (library 0.38) using:
brew upgrade dialog-if
works swimmingly under MacOS Catalina (10.15.4). I did need to install the command line tools first using:
xcode-select --install
(I’m guessing that’s because this is my first Dialog update since “upgrading” to Catalina from Mavericks.)
Also, as indicated in the OP, I had to copy the standard and debug libraries to my usual working directory for Dialog projects.
Thank you so much to @vickio for making it so easy and of course to @lft for the amazing work that is Dialog!
Skinny Mike