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GNU Screen does not support colors specification as letters anymore.
Here is relevant quote from manpage:
> The old format of specifying colors by letters (k,r,g,y,b,m,c,w) is
> now deprecated.
And by deprecated they mean doesn't work anymore.
Unfortunately, macOS ships screen version 4.00.03 and I couldn't figure
out a way to have screenrc syntax to work on both 5.0 and 4.0 versions
at the same time.
One more problem is `screen --version` changed return code, so even code
for checking if screen is installed at all doesn't work anymore. Need
to figure out a proper way forward. For now I just installed screen
version 5.0.0 from homebrew to fix macOS setup and at the same time make
Linux machines happy as well.
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