'

LINKS
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debian packages:
https://packages.debian.org/bullseye/main/mangohud
github repo:
https://github.com/flightlessmango/MangoHud
………………..

NOTES
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many opengl games will requiere to use MANGOHUD_DLSYM=1 env var
so “MANGOHUD_DLSYM=1 mangohud game” from terminal.
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source