With the new postgresql11-server-devel (which is good for building extensions)
all packages that only need to have libpq dependency but are using pg_config to
determine where to find lib and header can't be build without adding the full
postgresql-server-devel in BuildRequires.

As this package is not present in 42.3, 15.0 distribution, this lead to
unresolvable for those target, or need to readjust all spec files with again
%if .

So the question is: shouldn't pg_config be in postgresql-devel normal package
instead of server-devel-package ? Or what is the best way to handle the build ?