Build RPM to just install files

when you list files in %files section these files are expected to reside within %{buildroot} directory. As Fedora documentation says since Fedora 10 buildroot can't be redefined in the spec, so yes, you have to create a required filesystem hierarchy within %buildroot, copy there your font files and then mention them in %files:

...
%install

mkdir -p %{buildroot}/usr/share/fonts
cp /path/to/existing/MyFont.ttf %buildroot/usr/share/fonts/
...

%files
%defattr(0644, root,root)
/usr/share/fonts/*

your distribution probably has handy macros for standard font files locations, their proper registation in the system upon installation of the rpm etc, but most of these macros are vendor-specific. Also, you should copy your font files into SOURCES/ subdirectory and mention them in Source: (Source<N>:) tag in the rpm spec (just an example, a number can be any):

Name: myfonts
Summary: my fonts package
...
Source5: MyFont.ttf
...

Then you may use something like this in the %install section:

cp %{SOURCE5} %buildroot/usr/share/fonts/

instead of a full path to the MyFont.ttf.

Update: You're right about missing dependencies: this is not artifacts (files, directories etc) on the filesystem, this is records in the RPM db (in /var/lib/rpm). So to solve the problem you have to work with that DB.

So if you have unsatisifed dependencies in the generated RPM package you have two options:

1. if you simply wish to have a convenient way to distribute few files w/o tight integration with standard system facilities (see below), then you may simply turn off all rpm automatic dependency calculations. Use AutoReqProv: no to completely disable all that stuff.
2. However you may need to build a package with a better integration with the rest of the OS. For example, fonts may need a registration within appropriate system facilities, e.g. fontconfig. Unfortunately, different Linux rpm distributions have slightly different, eh-hm, customs regarding that. Actually you have to check how this process is organized in your distribution in already existing font packages. You may take a suitable source rpm package (check http://rpmfind.net or http://rpm.pbone.net RPM search engines), extract its .spec-file and study how %prein, %postin, %preun and %postun section of the spec are organized. Obviously, font packages usually carry -fonts- in their name :)

Afterall, you may display dependencies and provides of an uninstalled rpm package with rpm --query --requires --package </path/to/file.rpm> and rpm --query --provides --package </path/to/file.rpm>. Installed packages' deps are shown with rpm --query --requires <rpm_name> and so on.

As an answer for your edited question, the following might be the answer you seek:

Name: test
Version: 1.0.0
Release: 1
Copyright: Copyright info
Group: Applications/System
BuildArch: noarch

%description
Brief description of software package.

%prep

%build

%install
mkdir -p %{buildroot}/
cp -r ./* %buildroot/

%clean

%files
/*

Here we consider every file in the BUILD directory to be a part of the package. This is done by placing /* under %files.

Hope this addresses your question correctly.