+The guess_source option determines whether the source package is
+guessed at if there is no obviously correct package. Things that use
+this function for non-transient output should set this to false,
+things that use it for transient output can set this to true.
+Currently it defaults to true, but that is not a sane option.
+
+
+=cut
+
+sub make_source_versions {
+ my %param = validate_with(params => \@_,
+ spec => {package => {type => SCALAR|ARRAYREF,
+ },
+ arch => {type => SCALAR|ARRAYREF|UNDEF,
+ default => ''
+ },
+ versions => {type => SCALAR|ARRAYREF,
+ default => [],
+ },
+ guess_source => {type => BOOLEAN,
+ default => 1,
+ },
+ source_version_cache => {type => HASHREF,
+ optional => 1,
+ },
+ debug => {type => SCALARREF|HANDLE,
+ optional => 1,
+ },
+ warnings => {type => SCALARREF|HANDLE,
+ optional => 1,
+ },
+ },
+ );
+ my ($warnings) = globify_scalar(exists $param{warnings}?$param{warnings}:undef);
+ my ($debug) = globify_scalar(exists $param{debug} ?$param{debug} :undef);
+
+ my @packages = grep {defined $_ and length $_ } make_list($param{package});
+ my @archs = grep {defined $_ } make_list ($param{arch});
+ if (not @archs) {
+ push @archs, '';
+ }
+ if (not exists $param{source_version_cache}) {
+ $param{source_version_cache} = \%_sourceversioncache;
+ }
+ if (grep {/,/} make_list($param{package})) {
+ croak "Package names contain ,; split on /,/ and call make_source_versions with an arrayref of packages"
+ }
+ my %sourceversions;
+ for my $version (make_list($param{versions})) {
+ if ($version =~ m{(.+)/([^/]+)$}) {
+ # Already a source version.