slim spec requires arguments

[Globe Trotter]

Hi,
I use slim and have realized that it is retired/no longer supoorted from F31. 

So, I got the src.rpm from teh F30 stable and was trying to rebuild it at least to see
what the issues were.
However, the rpmbuild 

$ rpmbuild -bb slim.spec 
error: This macro requires some arguments

I have never had experience with passing such macros. I looked into the spec file but can
not figure out how to do this. Here is the spec file:
UNTITLED - CentOS Pastebin Service

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UNTITLED - CentOS Pastebin Service


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Any suggestions?
Many thanks!