+ # Attempt to retrieve missing version information from Git
+ chomp(my $gr = `git describe --tags 2>/dev/null`);
+ if ($gr =~ /^v([0-9]+)\.([0-9]+)\.([0-9]+)(?:-\d+-(\w+))?$/) {
+ $version{MAJOR} = $1 unless defined $version{MAJOR};
+ $version{MINOR} = $2 unless defined $version{MINOR};
+ $version{PATCH} = $3 unless defined $version{PATCH};
+ $version{LABEL} = $4 if defined $4;
+ }
+
+ # The user is using a stable release which does not have
+ # a label attached.
+ $version{LABEL} = 'release' unless defined $version{LABEL};
+
+ # If any of these fields are missing then the user has deleted the
+ # version file and is not running from Git. Fill in the fields with
+ # dummy data so we don't get into trouble with undef values later.
+ $version{MAJOR} = '0' unless defined $version{MAJOR};
+ $version{MINOR} = '0' unless defined $version{MINOR};
+ $version{PATCH} = '0' unless defined $version{PATCH};
+
+ return %version;
+}
+
+sub module_installed($) {