--- /usr/lib/clang-analyzer/scan-build/scan-build	2012-12-31 12:56:00.000000000 +0100
+++ foo/scan-build	2013-01-10 12:38:17.326066388 +0100
@@ -1464,6 +1464,9 @@
     $Clang = Cwd::realpath("$RealBin/clang");
   }
   if (!defined $Clang || ! -x $Clang) {
+    $Clang = Cwd::realpath("/usr/bin/clang");
+  }
+  if (!defined $Clang || ! -x $Clang) {
     if (!$displayHelp) {
       DieDiag("error: Cannot find an executable 'clang' relative to scan-build." .
    	          "  Consider using --use-analyzer to pick a version of 'clang' to use for static analysis.\n");