I.3. Changes from 2.7.1 to 2.7.2
- 
upsdrvctl is now installed to $prefix/sbin rather than $driverexec.
  This usually means moving from /bin to /sbin, apart from few exceptions.
  In all cases, please adapt your scripts.
- 
FreeDesktop Hardware Abstraction Layer (HAL) support was removed.
  Please adapt your packaging files, if you used to distribute the
  nut-hal-drivers package.
- 
This is a good time to point out that for stricter packaging systems, it may
  be beneficial to add "--enable-option-checking=fatal" to the ./configure
  command line, in order to quickly pick up any other removed option flags.