installing <namespace/header.h> to $(includedir)/namespace/

[Brian Clarkson]

Hello.

What is the accepted way of specifying additional subdirectories in the 
install path for headers in automake these days?

I found this in an old thread (2001)

something1incdir = $(includedir)/dir1
something1inc_HEADERS = header1.h header2.h ...

something2incdir = $(includedir)/dir2
something2inc_HEADERS = header3.h hea

(clipped from 
http://sources.redhat.com/ml/automake/2001-04/msg00346.html)

but that "something1incdir" doesn't seem to follow any of the patterns 
described in the current automake manual.

Brian