please document the development prerequisites

[hgy59]

when building proxmoxbackupclient_go I get the error

Package 'ayatana-appindicator3-0.1', required by 'virtual:world', not found

I will have to install (i.e. cross compile) ayatana-appindicator3-0.1, but there might be other dependencies.

I am missing a "how to build" documentation that lists all build prerequisites.

[hgy59]

it turned out that ayatana-appindicator3-0.1 itself depends on gtk.

But I want to create a proxmoxbackupclient cli tool for headless linux systems.
What am I missing?

[hgy59]

I am still looking for instructions on how to build proxmoxbackupclient_cli on linux for linux without gui related dependencies.

[hgy59]

If found a solution by removing the windows dependencies (see SynoCommunity/spksrc#6628).

Anyway the build of the client for headless linux systems should be supported officially.