Thanks for the pointer tobyink.
I get the impression that this section of the EU::MM documentation is telling me what I need to know, but I can't make any sense of the table that it includes: 
  make install
    make alone puts all relevant files into directories that are named
+ by
    the macros INST_LIB, INST_ARCHLIB, INST_SCRIPT, INST_MAN1DIR and
    INST_MAN3DIR. All these default to something below ./blib if you a
+re
    *not* building below the perl source directory. If you *are* build
+ing
    below the perl source, INST_LIB and INST_ARCHLIB default to ../../
+lib,
    and INST_SCRIPT is not defined.

    The *install* target of the generated Makefile copies the files fo
+und
    below each of the INST_* directories to their INSTALL* counterpart
+s.
    Which counterparts are chosen depends on the setting of INSTALLDIR
+S
    according to the following table:

                                     INSTALLDIRS set to
                               perl        site          vendor

                     PERLPREFIX      SITEPREFIX          VENDORPREFIX
      INST_ARCHLIB   INSTALLARCHLIB  INSTALLSITEARCH     INSTALLVENDOR
+ARCH
      INST_LIB       INSTALLPRIVLIB  INSTALLSITELIB      INSTALLVENDOR
+LIB
      INST_BIN       INSTALLBIN      INSTALLSITEBIN      INSTALLVENDOR
+BIN
      INST_SCRIPT    INSTALLSCRIPT   INSTALLSITESCRIPT   INSTALLVENDOR
+SCRIPT
      INST_MAN1DIR   INSTALLMAN1DIR  INSTALLSITEMAN1DIR  INSTALLVENDOR
+MAN1DIR
      INST_MAN3DIR   INSTALLMAN3DIR  INSTALLSITEMAN3DIR  INSTALLVENDOR
+MAN3DIR

    The INSTALL... macros in turn default to their %Config
    ($Config{installprivlib}, $Config{installarchlib}, etc.) counterpa
+rts.

    You can check the values of these variables on your system with

        perl '-V:install.*'

[download]
If I can just get 'make install' to install into INSTALLSITEARCH (which is mentioned in the table), then that will be fine.
But neither INSTALLDIRS => 'perl', nor INSTALLDIRS => 'site', nor INSTALLDIRS => 'vendor', will do that, and everything else I try turns out to be either ineffective or just plain rubbish.

Can anyone tell from that (supposed) "table" just what argument I need to give to WriteMakefile() ?

Cheers,
Rob

In reply to Re^2: How to tell EU::MM to install a pure-perl module into an architecture-specific location by syphilis
in thread How to tell EU::MM to install a pure-perl module into an architecture-specific location by syphilis

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