diff --git a/debian/changelog b/debian/changelog
index 39e8098..1c602a9 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,8 +3,10 @@ multistrap (2.1.12) unstable; urgency=low
   * Fix hook implementation if no hooks in use
   * Accumulate warnings from system calls and hooks and report to user
     at the end of the operation.
+  * Ensure that realpath does really exist (local test debugging) and
+    guard against an undefined keyring pkg variable.
 
- -- Neil Williams <codehelp@debian.org>  Tue, 08 Feb 2011 20:38:33 +0000
+ -- Neil Williams <codehelp@debian.org>  Wed, 09 Feb 2011 17:19:37 +0000
 
 multistrap (2.1.11) unstable; urgency=low
 
diff --git a/multistrap b/multistrap
index 8326a3f..410df54 100755
--- a/multistrap
+++ b/multistrap
@@ -78,6 +78,10 @@ die ($msg)
 	if (not defined $file);
 undef ($msg);
 
+my $realpath = `which realpath`;
+chomp ($realpath);
+die (_g("ERR: Unable to find realpath - missing dependency.\n")) if (not -x ($realpath));
+
 $cachedir = "var/cache/apt/"; # archives
 $libdir = "var/lib/apt/";     # lists
 $etcdir = "etc/apt/";         # sources
@@ -256,6 +260,7 @@ if ((defined $k) and (not defined $noauth)) {
 	}
 	system ("$str apt-get -y -d --reinstall install $k");
 	foreach my $keyring_pkg (values %keyrings) {
+		next if (not defined $keyring_pkg);
 		my @files=();
 		my $file = `find /var/cache/apt/archives/ -name "$keyring_pkg*"|grep -m1 $keyring_pkg`;
 		chomp ($file);