> Looking for the gcc..g++ suite manpages, expected to find them in 'gcc-doc' but it's missing.
> Anybody point me in the right direction ?

I found the answer in
https://unix.stackexchange.com/questions/523079/what-packages-the-man-pages-for-gcc-on-debian-10-buster-testing
<https://unix.stackexchange.com/questions/523079/what-packages-the-man-pages-for-gcc-on-debian-10-buster-testing>

Basically, add the "contrib" and "non-free" repositories to your deb
sources, then install "gcc-doc".

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-Robert Montante, Ph.D.
 Department of Mathematical and Digital Sciences
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