automake: arbitrary code execution

From the Red Hat bugzilla entry:

Jim Meyering found a race condition in the way Automake used to prepare content of directories hierarchy (top-level directory and its subdirectories), when the "distdir" based Automake target was used. A local attacker could use this flaw to inject malicious content into the resulting directory and potentially subsequently execute arbitrary code with the privileges of the user issuing the "./configure" command.