Script to easily rebuild a SRPM
Between RHEL/CentOS 5 and 6 the default RPM compression format was
changed to xz. As such, trying to build a recent Fedora or Cent6 SRPM on
Cent5 will error out with a message like
error: unpacking of archive failed on file foo;51a4c2a5: cpio: MD5 sum mismatch
because tar …