Hello,

In the manual, 
http://sources.redhat.com/automake/automake.html#Invoking-aclocal,
I read about the `--print-ac-dir' option:

Prints the name of the directory that |
|aclocal will search to find third-party .m4 files. When this option is 
given, normal processing is suppressed. This option can be used by a 
package to determine where to install a macro file.

I find the last sentence a bit strange because to me that sounds like 
Automake suggests that packagers should install macro files in a 
hard-coded directory not relative to $(prefix). IIUC that
that contradicts the discussion in section "Install to Hard-Coded Locations"

http://sources.redhat.com/automake/automake.html#Hard_002dCoded-Install-Paths

Cheers,
Peter