fix typos

configure.in

@@ -615,7 +615,7 @@ AC_CHECK_LIB(l, yywrap,,
     AC_CHECK_LIB(fl, yywrap))
 AC_CHECK_LIB(IDL, IDL_file_set,BUILD_XPIDL=1,
   [echo libIDL will be required starting the week of 12-APR-1999.]
-  [echo Get yourself an RPM our source package from ftp://ftp.mozilla.org/]
+  [echo Get yourself a RPM or source package from ftp://ftp.mozilla.org/]
   [echo before your tree is HOSED.]
   [echo See http://www.rpi.edu/~veliaa/libIDL/ for more information.]
   [sleep 3])