On OS X, check if the Universal SDK is installed or fail with an explicit

error message.

configure

@@ -180,6 +180,20 @@ case $SYSTEM in
 esac
 echo "System:  $SYSTEM"
 
+#
+# Mac OS X check for the Universal SDK
+#
+if [ $SYSTEM = Darwin -a ! -d /Developer/SDKs/MacOSX10.4u.sdk ]; then
+  echo
+  echo "You need to install the Universal SDK in order to build Transmission:"
+  echo "  Get your Xcode CD or package"
+  echo "  Restart the install"
+  echo "  When it gets to \"Installation Type\", select \"Customize\""
+  echo "  Select \"Mac OS X 10.4 (Universal) SDL\" under \"Cross Development\""
+  echo "  Finish the install."
+  exit 1
+fi
+
 #
 # OpenSSL settings
 #