diff --git a/kdesvn-build b/kdesvn-build
index 3746079..c73f413 100755
--- a/kdesvn-build
+++ b/kdesvn-build
@@ -935,7 +935,7 @@ sub checkout_module_path
 
     chdir($pathinfo{'path'});
 
-    push @args, ('svn', 'co');
+    push @args, ('svn', 'co', '--non-interactive');
     push @args, '-N' if scalar @path;
     push @args, svn_module_url($module);
     push @args, $pathinfo{'module'};
@@ -964,7 +964,7 @@ sub update_module_path
 
     chdir $fullpath;
 
-    push @args, ('svn', 'up');
+    push @args, ('svn', 'up', '--non-interactive');
     push @args, '-N' if scalar @path;
 
     note "Updating g[$module]";
@@ -994,6 +994,98 @@ sub update_module_path
     return update_module_subdirectories($module, @path);
 }
 
+# The function checks whether subversion already has an ssl acceptance
+# notification for svn.kde.org, and if it's doesn't, installs one.
+# Problems: First off, installing any kind of "accept this ssl cert without
+# user's active consent" kind of sucks.  Second, this function is very
+# specific to the various signature algorithms used by svn, so it could break
+# in the future.  But there's not a better way to skip warnings about svn.kde.org
+# until the site has a valid ssl certificate.
+# 
+# Accepts no arguments, has no return value.
+sub install_missing_ssl_signature
+{
+    my $sig_dir  = "$ENV{HOME}/.subversion/auth/svn.ssl.server";
+    my $sig_file = "ec08b331e2e6cabccb6c3e17a85e28ce";
+
+    debug "Checking $sig_dir/$sig_file for KDE SSL signature.";
+
+    if (-e "$sig_dir/$sig_file")
+    {
+        debug "KDE SSL Signature file present.";
+        return;
+    }
+
+    debug "No KDE SSL Signature found.";
+    return if pretending;
+
+    # Now we're definitely installing, let the user know.
+    warning "Installing b[y[KDE SSL signature] for Subversion.  This is to avoid";
+    warning "Subversion warnings about KDE's self-signed SSL certificate for svn.kde.org";
+
+    # Make sure the directory is created.
+    if(not super_mkdir($sig_dir))
+    {
+        error "Unable to create r[Subversion signature] directory!";
+        error "$!";
+
+        return;
+    }
+
+    my $sig_data =
+'K 10
+ascii_cert
+V 1216
+MIIDijCCAvOgAwIBAgIJAO9Ca3rOVtgrMA0GCSqGSIb3DQEBBQUAMIGLMQswCQYDVQQGE\
+wJERTEQMA4GA1UECBMHQmF2YXJpYTESMBAGA1UEBxMJTnVlcm5iZXJnMREwDwYDVQQKEw\
+hLREUgZS5WLjEMMAoGA1UECxMDU1ZOMRQwEgYDVQQDEwtzdm4ua2RlLm9yZzEfMB0GCSq\
+GSIb3DQEJARYQc3lzYWRtaW5Aa2RlLm9yZzAeFw0wNTA1MTExMDA4MjFaFw0xNTA1MDkx\
+MDA4MjFaMIGLMQswCQYDVQQGEwJERTEQMA4GA1UECBMHQmF2YXJpYTESMBAGA1UEBxMJT\
+nVlcm5iZXJnMREwDwYDVQQKEwhLREUgZS5WLjEMMAoGA1UECxMDU1ZOMRQwEgYDVQQDEw\
+tzdm4ua2RlLm9yZzEfMB0GCSqGSIb3DQEJARYQc3lzYWRtaW5Aa2RlLm9yZzCBnzANBgk\
+qhkiG9w0BAQEFAAOBjQAwgYkCgYEA6COuBkrEcEJMhzHajKpN/StQwr/YeXIXKwtROWEt\
+7evsXBNqqRe6TuUc/iVYgBuZ4umVlJ/qJ7Q8cSa8Giuk2B3ShZx/WMSC80OfGDJ4LoWm3\
+uoW8h45ExAACBlhuuSSa7MkH6EXhru1SvLbAbTcSVqyTzoWxhkAb8ujy6CUxHsCAwEAAa\
+OB8zCB8DAdBgNVHQ4EFgQUx2W0046HfWi1fGL1V8NlDJvnPRkwgcAGA1UdIwSBuDCBtYA\
+Ux2W0046HfWi1fGL1V8NlDJvnPRmhgZGkgY4wgYsxCzAJBgNVBAYTAkRFMRAwDgYDVQQI\
+EwdCYXZhcmlhMRIwEAYDVQQHEwlOdWVybmJlcmcxETAPBgNVBAoTCEtERSBlLlYuMQwwC\
+gYDVQQLEwNTVk4xFDASBgNVBAMTC3N2bi5rZGUub3JnMR8wHQYJKoZIhvcNAQkBFhBzeX\
+NhZG1pbkBrZGUub3JnggkA70Jres5W2CswDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0BAQU\
+FAAOBgQDjATlL2NByFDo5hhQAQdXjSYrMxil7zcpQjR+KYVizC7yK99ZsA0LYf/Qbu/pa\
+oMnmKLKWeNlF8Eq7/23TeAJmjw1pKi97ZO2FJ8jvy65iBEJLRYnpJ75dvg05iugm9GZ5w\
+Px6GHZmkSrteGDXgVbbSDy5exv1naqc+qEM7Ar4Xw==
+K 8
+failures
+V 1
+8
+K 15
+svn:realmstring
+V 23
+https://svn.kde.org:443
+END
+';
+
+    # Remove the \<newline> parts (the gibberish should be one big long
+    # line).
+    $sig_data =~ s/\\\n//gm;
+
+    if(not open SIG, ">$sig_dir/$sig_file")
+    {
+        error "Unable to open KDE SSL signature file!";
+        error "r[$!]";
+
+        return;
+    }
+
+    if(not print SIG $sig_data)
+    {
+        error "Unable to write to KDE SSL signature file!";
+        error "r[$!]";
+    }
+
+    close SIG;
+}
+
 # Subroutine to run a command with redirected STDOUT and STDERR.  First parameter
 # is name of the log file (relative to the log directory), and the
 # second parameter is a reference to an array with the command and
@@ -1038,8 +1130,16 @@ sub log_command
         # Redirect stdout and stderr to the given file.
         if (not debugging)
         {
-# Comment this out because it conflicts with make-install-prefix
-#            open (STDIN, "</dev/null");
+
+# The stdin redirection used to be commented out because it will cause
+# problems for users using make-install-prefix when a password is desired, or
+# when svn complains about the SSL signature.  I think I've fixed the latter,
+# and I've decided that users should configure sudo to not need the password,
+# or simply run sudo kdesvn-build instead of using make-install-prefix.  Now
+# other commands will fail instead of hanging at the terminal.  As it stands, it can still
+# be canceled using an exported env var just in case.
+
+            open (STDIN, "</dev/null") unless exists $ENV{'KDESVN_BUILD_USE_TTY'};
             open (STDOUT, ">$logdir/$filename.log") or do {
                 error "Error opening $logdir/$filename.log for logfile.";
                 # Don't abort, hopefully STDOUT still works.
@@ -1307,7 +1407,20 @@ sub safe_make (@)
 
         $description = $apidox ? "API Documentation" : clr "g[$module]";
         unshift @args, $make, $apidox ? 'install-apidox' : 'install';
-        unshift @args, split(' ', get_option ($module, 'make-install-prefix'));
+
+        my @install_cmd = split(' ', get_option ($module, 'make-install-prefix'));
+        if (@install_cmd)
+        {
+            # Add -S option if we're running sudo and it's not already
+            # present.  This causes sudo to read the password from stdin (and
+            # consequently fail instead of hanging at the terminal).
+            if ($install_cmd[0] eq 'sudo' and not grep (/^-S$/, @install_cmd))
+            {
+                splice (@install_cmd, 1, 0, '-S'); # Add -S right after 'sudo'
+            }
+
+            unshift @args, @install_cmd;
+        }
 
         info "\tInstalling $description.";
     }
@@ -2708,6 +2821,10 @@ sub handle_updates
         }
     }
 
+    # Make sure KDE's SSL signature is present since --non-interactive is
+    # passed to svn.
+    install_missing_ssl_signature();
+
     foreach $module (@{$update_ref})
     {
         my $fullpath = get_fullpath($module, 'source');
diff --git a/kdesvn-buildrc-sample b/kdesvn-buildrc-sample
index 0fe3ea8..0f6bc33 100644
--- a/kdesvn-buildrc-sample
+++ b/kdesvn-buildrc-sample
@@ -79,7 +79,12 @@ global
 
 # If you would like install KDE to the system (DO NOT INSTALL *over* a prior
 # installation!), then you'll probably need to use sudo to install everything.
-# 	make-install-prefix sudo
+#
+# The -S parameter causes sudo to read from standard input (which is redirected by
+# kdesvn-build).  This means that if sudo has to ask for your password, it will fail,
+# you need to configure sudo to be able to run "make install" and "unsermake install"
+# without requesting a password.
+# 	make-install-prefix sudo -S
 
 # You can use the set-env option to add values to the build environment.
 	set-env LDFLAGS -Wl,-O1   # Optimize the linker, takes longer.