checksums for multiple distfiles?

[Jack Howarth]

  I am having problems with the correct syntax for
adding checksums for multiple distfiles in a Portfile.
My first attempt so far at a new port looks like...

# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
# $Id$
PortSystem          1.0
name                molmol
version             2k.2.0
categories          science
maintainers         howarth at bromo.med.uc.edu
description         Molecular graphics display program
long_description    MOLMOL is a molecular graphics program for displaying, analyzing, \
                    and manipulating the three-dimensional structure of biological \
                    macromolecules, with special emphasis on the study of protein \
                    or DNA structures determined by NMR. The program runs on UNIX \
                    and Windows NT/95/98/2000 and is freely available. It does not work \
                    properly with RNA.
homepage            http://www.mol.biol.ethz.ch/wuthrich/software/molmol/
platforms           darwin
master_sites        ftp://ftp.mol.biol.ethz.ch/software/MOLMOL/unix-gzip
distfiles           molmol-2k.2.0-src.tar.gz \
                    molmol-2k.2.0-doc.tar.gz
checksums           md5 e1f4416d8041a67fa08cadb03ed91c7c \
                    sha1 09482a1dea601563ca64e773dc0ec47019e22c63 \
                    rmd160 b1de89953631dd9b11928751d7853cb511bf45f0 \
                    md5 517545b60b0179ab691a679ed29903a7 \
                    sha1 b47551283fa19f57f4d5edcbd52f725055d80b7f \
                    rmd160 08b3e21ab6eb7c9044e59373334181ff91ca8a53
depends_lib         port:openmotif \
                    port:glut \
                    port:tiff \
                    port:jpeg \
                    port:libpng
patchfiles          molmol-build.diff
destroot {
    # Install example files not installed by the Makefile
    file mkdir ${destroot}${prefix}/share/${name}
    file copy ${worksrcpath} \
        ${destroot}${prefix}/share/${name}
    file mkdir ${destroot}${prefix}/bin
    ln -s ${prefix}/share/${name}/${name} ${destroot}${prefix}/bin/${name}
    file mkdir ${destroot}${prefix}/share/doc/${name}
    ln -s ${prefix}/share/${name}/COPYING ${destroot}${prefix}/share/doc/${name}/COPYING
    ln -s ${prefix}/share/${name}/man ${destroot}${prefix}/share/doc/${name}/man
}

which produces...

--->  Computing dependencies for molmol
--->  Fetching molmol
--->  Attempting to fetch molmol-2k.2.0-src.tar.gz from http://distfiles.macports.org/molmol
--->  Attempting to fetch molmol-2k.2.0-src.tar.gz from http://arn.se.distfiles.macports.org/molmol
--->  Attempting to fetch molmol-2k.2.0-src.tar.gz from http://aarnet.au.distfiles.macports.org/pub/macports/mpdistfiles/molmol
--->  Attempting to fetch molmol-2k.2.0-src.tar.gz from ftp://ftp.mol.biol.ethz.ch/software/MOLMOL/unix-gzip
--->  Attempting to fetch molmol-2k.2.0-doc.tar.gz from http://distfiles.macports.org/molmol
--->  Attempting to fetch molmol-2k.2.0-doc.tar.gz from http://arn.se.distfiles.macports.org/molmol
--->  Attempting to fetch molmol-2k.2.0-doc.tar.gz from http://aarnet.au.distfiles.macports.org/pub/macports/mpdistfiles/molmol
--->  Attempting to fetch molmol-2k.2.0-doc.tar.gz from ftp://ftp.mol.biol.ethz.ch/software/MOLMOL/unix-gzip
--->  Verifying checksum(s) for molmol
Error: No checksum set for molmol-2k.2.0-src.tar.gz
Error: No checksum set for molmol-2k.2.0-doc.tar.gz
Error: Target org.macports.checksum returned: Unable to verify file checksums
Error: Status 1 encountered during processing.

I am having trouble finding an existing Portfile which uses multiple
distfiles to discover the correct syntax in this case. Thanks in advance
for any advice.
           Jack