Note for distro maintainers:

When writing sleep hooks, please consider adding any needed hooks to the package
that requires the hooks, rather than pm-utils.  

An example would be if you distro wants anacron to run on resume -- the optimal
fix would be to have the anacron package install a hook in 
/usr/lib/pm-utils/sleep.d that wakes anacron up on resume.

This will also help package maintenance by allowing package maintainers to 
keep track of what the best way to handle any suspend/resume functionality their
package requires insteas of leaving it up to the pm-utils maintainers to guess
at what functionality is needed.

To make this easier, pm-utils supports pkg-config, which makes it easy for
packages that use automake to detect the presence of pm-utils and the locations
that hooks should be installed in.  The pm-utils pkgconfig file exports the 
following variables:

pm_libdir: This is the directory that the pm-utils infrastructure is installed
	   in.  /usr/lib/pm-utils is the default value

pm_sysconfdir: This is the directory that any package-specific pm-utils related
	       config files should be installed in.  
	       Defaults to /etc/pm/config.d

pm_sleephooks: This is the directory that sleep hooks are installed in.  
	       Defaults to ${pm_libdir}/sleep.d

pm_powerhooks: This is the directory that power management hooks are installed
	       in.  Defaults to ${pm_libdir}/power.d

pm_sleepmodules: This is the directory that sleep modules are installed in.  
		 Defaults to ${pm_libdir}/module.d