See the following example:
```
$rpm --version
RPM version 4.14.3
$ rpm --define '%foo(b:) %{-b}' --eval '%foo -b2'
-b 2
```
The macro adds a space between flag and argument, which may affect passing to
applications as shown by the following example:
```
$ python3 -bb
Python 3.6.15 (default, Sep 23 2021, 15:41:43) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
<CTRL-D>
```
Passing the option through a rpm macro returns:
```
$ rpm --define '%foo(b:) python3 %{-b}' --eval '%foo -bb`
python3 -b b
```
Running the generated command fails:
```
$`rpm --define '%foo(b:) python3 %{-b}' --eval '%foo -bb'`
python3: can't open file 'b': [Errno 2] No such file or directory
```
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