Lilypond 1.5.60 and --prefix option

[Maurizio Tomasi]

I am trying to compile Lilypond 1.5.60.  If I run

-----------------------------------------------------------------
% ./configure
(lots of stuff...)

% make all
(other stuff...)
-----------------------------------------------------------------

all goes well, but if I use the command-line switch `--prefix=/usr' with
`configure', I get:

-----------------------------------------------------------------
% ./configure --prefix=/usr
(lots of stuff, the same as above...)

% make all
make/stepmake.make:71: /usr/share/stepmake/stepmake/no-builtin-rules.make:
        No such file or directory
make/stepmake.make:82: /usr/share/stepmake/stepmake/generic-vars.make: No
        such file or directory
make/stepmake.make:82: /usr/share/stepmake/stepmake/toplevel-vars.make: No
        such file or directory
make/stepmake.make:82: /usr/share/stepmake/stepmake/po-vars.make: No such
        file or directory
make/stepmake.make:82: /usr/share/stepmake/stepmake/install-vars.make: No
        such file or directory
make/substitute.make:4: /usr/share/stepmake/stepmake/substitute-vars.make:
        No such file or directory
make/substitute.make:5:
/usr/share/stepmake/stepmake/substitute-rules.make: No such file or
        directory
make/stepmake.make:89: /usr/share/stepmake/stepmake/generic-rules.make: No
        such file or directory
...
-----------------------------------------------------------------

and so on.  By tracing file `config.log' I do not see any error
message.  So what's wrong with my configuration?  I have Guile 1.4.1.

Maurizio