IMSP-CVS-head installing in 'wrong' dir

[OpenMacNews]

hi all,
i've
  cyrus-sasl-2.1.20
  cyrus-imap-2.2.8
on
  OSX 10.3.6
as per 
<http://www.mail-archive.com/info-cyrus@lists.andrew.cmu.edu/msg10980.html>, the
IMSP 1.7b release is not compatible w/ SASL2, so i've DL'd today's CVS-head.

configure w/
   aclocal -I cmulocal
   autoheader
   autoconf
   ./configure \
     --prefix=/usr/local/cyrus-imsp \
     --with-sasldir=/usr/local/cyrus-sasl/lib \
   --disable-gssapi \
   --with-lock=flock \
   --with-auth=unix
and subsequent 'make' & 'make install' complete w/o errors.
but 'make install' installs in /cyrus/usr/cyrus/bin/imspd, rather than the 
spec'd cmd-line prefix.

clearly, it's being overridden ... in Makefile:
   install::
       - mkdir ${DESTDIR}/cyrus
       - mkdir ${DESTDIR}/cyrus/usr
       - mkdir ${DESTDIR}/cyrus/usr/cyrus
       - mkdir ${DESTDIR}/cyrus/usr/cyrus/bin
       @for d in  $(SUBDIRS); \
       do \
           (cd $$d; echo "### Making" install "in" `pwd`;  \
               $(MAKE) $(MFLAGS) DESTDIR=$(DESTDIR) install ;  \
               echo "### Done with" `pwd`);        \
       done
  #######################
  ## QUESTION
       where/how best to get the install to honor my location spec'n?  is 
there another cmd-line param that i need to set, or sumthin' , or should i just 
hack the Makefile?

thx,
richard
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