Check whether a macro is undefined or has a specific value

[Marco <listaddr@xxxxxxxxx>]

Hello,

as the subject says: If macro %{__foo} is defined and has value 1, I'd
like to do something; otherwise (undefined or value != 1), skip.

In my spec file, I've tried

%if %{__foo}
# do something
%endif

%if %{__foo} = "1"
# do something
%endif

but they all fail. Thanks in advance for any help.
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