diff -ruN Mail-IMAPClient-3.43.orig/Makefile.PL Mail-IMAPClient-3.43/Makefile.PL
--- Mail-IMAPClient-3.43.orig/Makefile.PL	2021-02-16 17:47:10.000000000 +0100
+++ Mail-IMAPClient-3.43/Makefile.PL	2021-06-28 22:55:47.886460876 +0200
@@ -4,39 +4,6 @@
 
 use 5.008_001;
 
-my @missing;
-my %optional = (
-    "Authen::NTLM"     => { for => "Authmechanism 'NTLM'" },
-    "Authen::SASL"     => { for => "Authmechanism 'DIGEST-MD5'" },
-    "Compress::Zlib"   => { for => "COMPRESS DEFLATE support" },
-    "Digest::HMAC_MD5" => { for => "Authmechanism 'CRAM-MD5'" },
-    "Digest::MD5"      => { for => "Authmechanism 'DIGEST-MD5'" },
-    "IO::Socket::IP"   => { for => "IPv6 support" },
-    "IO::Socket::SSL"  => { for => "SSL enabled connections (Ssl => 1)" },
-    "Test::Pod"        => { for => "Pod tests", ver => "1.00" },
-);
-
-foreach my $mod ( sort keys %optional ) {
-    my $for = $optional{$mod}->{"for"} || "";
-    my $ver = $optional{$mod}->{"ver"} || "";
-    eval "use $mod $ver ();";
-    push @missing, $mod . ( $for ? " for $for" : "" ) if $@;
-}
-
-# similar message to one used in DBI:
-if (@missing) {
-    print( "The following optional modules were not found:",
-        map( "\n\t" . $_, @missing ), "\n" );
-
-    print <<'MSG';
-Optional modules are available from any CPAN mirror, reference:
-  https://metacpan.org/
-  https://www.cpan.org/modules/by-module/
-
-MSG
-    sleep 3;
-}
-
 # HACK: die on broken Parse::RecDescent 1.966002 through 1.967009
 # - rt.cpan.org#74593: Recent changes break Module::ExtractUse and ...
 # - rt.cpan.org#74733: Fails with Parse::RecDescent >= 1.966_002
@@ -92,45 +59,5 @@
     clean => { FILES => 'test.txt' },
 );
 
-set_test_data();
-
 exit 0;
 
-###
-### HELPERS
-###
-
-sub set_test_data {
-    unless ( -f "lib/Mail/IMAPClient.pm" ) {
-        warn("ERROR: not in installation directory\n");
-        return;
-    }
-
-    if ( -s "./test.txt" ) {
-        print("The file test.txt will be used for extended tests.\n");
-        return;
-    }
-
-    print <<EOF;
-
-(OPTIONAL) For extended tests during 'make test', create a file
-'test.txt' in the top level directory of this distribution (the same
-directory as the Makefile.PL, etc.).  This file must contain an IMAP
-server name or IP (server=...), a user account (user=...), and a
-password (passed=...).  A port (port=....) and an authentication
-mechanism to be used (authmechanism=...) can also be specified.
-
-Example:
-
---- BEGIN: test.txt ---
-server=localhost
-user=mytestuser
-passed=mypassword
-port=143
---- END: test.txt ---
-
-NOTE: When testing is completed, be sure to remove test.txt (either by
-hand or by 'make clean').
-
-EOF
-}