error disrupting opencv install on Debian

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Greetings

Debian Buster install being attempted.

Following the page: https://linuxize.com/post/how-to-inst...

and am unable to complete the cmake build system. Errors include:

Blockquote Output line: 'cc1plus: warning: command line option '-Wmissing-prototypes' is valid for C/OlbjC but not for C++' Output line: 'cc1: warning: command line option '-Wsign-promo' is valid for C++/ObjC++ but not for C' Output line: 'cc1plus: warning: unrecognized command line option '-Wno-unnamed-type-template-args' '

Blockquote

Those are lines from three different 'Build output check failed:' blocks

(Note - - - I am unable to replicate some of the single quote characters - - - - some are angled and some are vertical - sorry!)

(Have been successful, finally, to copy the error file - - - - but its a text file and the system only allows pic type attachments. So if a copy of the error file as text is desired please advise.)

TIA