Re: perl 5.22 incompatibility

Following up, almost all the problems were fixed in 2.6.19.
The remaining ones appear to be these, and are now patched
into the Debian package.

--- mhonarc-2.6.19.orig/lib/mhopt.pl
+++ mhonarc-2.6.19/lib/mhopt.pl
@@ -865,7 +865,7 @@
 sub update_data_2_1_to_later {
     no warnings qw(deprecated);
     # we can preserve filter arguments
-    if (defined(%main::MIMEFiltersArgs)) {
+    if (%main::MIMEFiltersArgs) {
        warn qq/         preserving MIMEARGS...\n/;
        %readmail::MIMEFiltersArgs = %main::MIMEFiltersArgs;
        $IsDefault{'MIMEARGS'} = 0;
--- mhonarc-2.6.19.orig/lib/mhamain.pl
+++ mhonarc-2.6.19/lib/mhamain.pl
@@ -1565,7 +1565,7 @@
 ##
 sub defineIndex2MsgId {
     no warnings qw(deprecated);
-    if (!defined(%Index2MsgId)) {
+    unless (%Index2MsgId) {
        foreach (keys %MsgId) {
            $Index2MsgId{$MsgId{$_}} = $_;
        }