diff -u cairo-0.11.1/Gtk2HsSetup.hs\~ cairo-0.11.1/Gtk2HsSetup.hs
--- cairo-0.11.1/Gtk2HsSetup.hs~	2010-11-25 17:16:11.000000000 +1000
+++ cairo-0.11.1/Gtk2HsSetup.hs	2010-11-25 17:32:40.000000000 +1000
@@ -187,7 +187,7 @@
      _ | modeGenerateRegFile   -> die "Generate Reg File not supported"
        | modeGenerateRegScript -> die "Generate Reg Script not supported"
        | otherwise             -> registerPackage verbosity
-                                    installedPkgInfo pkg lbi inplace packageDb
+                                    installedPkgInfo pkg lbi inplace [packageDb]
 
   where
     modeGenerateRegFile = isJust (flagToMaybe (regGenPkgConf regFlags))