# 2.5.13.51. RpmBuild

The `RpmBuild` step builds RPMs based on a spec file:

    from buildbot.plugins import steps

    f.addStep(steps.RpmBuild(specfile="proj.spec", dist='.el5'))

The step takes the following parameters

`specfile`

  The `.spec` file to build from

`topdir`

  Definition for `_topdir`, defaulting to the workdir.

`builddir`

  Definition for `_builddir`, defaulting to the workdir.

`rpmdir`

  Definition for `_rpmdir`, defaulting to the workdir.

`sourcedir`

  Definition for `_sourcedir`, defaulting to the workdir.

`srcrpmdir`

  Definition for `_srcrpmdir`, defaulting to the workdir.

`dist`

  Distribution to build, used as the definition for `_dist`.

`define`

  A dictionary of additional definitions to declare.

`autoRelease`

  If true, use the auto-release mechanics.

`vcsRevision`

  If true, use the version-control revision mechanics. This uses the `got_revision` property to determine the revision and define `_revision`. Note that this will not work with multi-codebase builds.