[Rpm-maint] [rpm-software-management/rpm] Define a macro if it is not defined (Discussion #2342)

[David Deaderick]

I need help understanding the syntax of defining a macro if it is not defined, as described at [Macro syntax](https://rpm-software-management.github.io/rpm/manual/macros.html)
```
%{!?with_python3: %global with_python3 1}
```

I am trying to build the following macro:
```
%global _TSCOVersion %{!?major:%global major 22}.%{!?minor:%global minor 4}.%{!?servicepack:%global servicepack 00}
```
I expect it to expand to: ```22.4.00```
but it expands to:  ```..```

Am I misunderstanding the syntax?

I am using RPM 4.14.3 on Red Hat Enterprise Linux 8.7.

Thank you,

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