Add --global option.

Ignore-this: 12cbdde57790c83d6cd249c296392d2f

darcs-hash:20081212130652-c1071-2fa165d15ee5fa41dec7cbc2f9b2aa2cc0341928.gz

configure

@@ -288,6 +288,7 @@ process_args ()
 	  echo " --fvia-C               use -fvia-C option"
 	  echo " --package-conf=<file>  optional local package configuration [$hcpkglocal]"
 	  echo " --user                 use current user's local package database"
+	  echo " --global               use global package database"
 	  echo " --version=<version>    library version [$version]"
 	  echo " --release=<version>    library release version [$release]"
 	  echo " --cache                expands into previous configure options"
@@ -354,6 +355,7 @@ process_args ()
             # sharedprefix="$prefix/share"
             sharedprefix="$prefix/lib"
           fi;;
+      -global|--global) ;;       # just for cabal
       -version=*|--version=*)
 	  version="$arg";;
       -release=*|--release=*)