Description of problem:

mvn-rpmbuild on Fedora 19 does not export M2_HOME

Version-Release number of selected component (if applicable):

javapackages-tools.noarch 0:0.12.0-1.fc19

How reproducible:

Packages in the f19 rebuild failed due to M2_HOME not set. See e.g.

https://koji.fedoraproject.org/koji/taskinfo?taskID=4996219

Error message is:

"Maven application directory was not specified, and ${maven.home} is not provided in the system properties. Please specify at least on of these."

The code generating this error message is:

if ( ( mavenHome == null ) && ( System.getProperty( "maven.home" ) == null ) )
{
    if ( !getSystemEnvVars().containsKey( "M2_HOME" ) )
    {
        throw new IllegalStateException( "Maven application directory was
            + "specified, and ${maven.home} is not provided in the system "
            + "properties. Please specify at least on of these." );
    }
}

I.e. if M2_HOME is set (like in mvn-rpmbuild for Fedora 18 and earlier) the exception is not thrown.
  
Actual results:

Failed builds due to M2_HOME not set

Expected results:

Working build

Additional info:

mvn-rpmbuild on Fedora 17 contains the line

export M2_HOME=/usr/share/maven