From Fedora Project Wiki
Proposed additional note for Eclipse Packaging guidelines
The spec file template illustrates building multiple features:
%build
%{eclipse_base}/buildscripts/pdebuild -f org.eclipse.plugin_feature
%{eclipse_base}/buildscripts/pdebuild -f org.eclipse.plugin.b_feature
It might also be worth mentioning that for packages that contain only a single feature, one can omit the -f option that specifies it. In such cases, the following is sufficient:
%build
%{eclipse_base}/buildscripts/pdebuild